第五章php数组操作_PHP教程

<br><!--?php <BR-->$usernames = array ('Alerk', 'Mary', 'Lucy', 'Bob', 'Jack', 'John', 'Mark' ); <br>foreach ( $usernames as $name ) <br>{ <br>echo $name . '<br>'; <br>} <br>?> <br> <br>output <br>Alerk <br>Mary <br>Lucy <br>Bob <br>Jack <br>John <br>Mark <br>1.2 用range()函数 <br><span style="CURSOR: pointer" onclick="doCopy('code99260')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$numbers = range ( 0, 10 ); <br>foreach ( $numbers as $num ) <br>{ <br>echo $num . '<br>'; <br>} <br>$letters = range ( 'a', 'z' ); <br>foreach ( $letters as $letter ) <br>{ <br>echo $letter . '<br>'; <br>} <br>?> <br> <br>output <br>0 <br>1 <br>2 <br>3 <br>4 <br>5 <br>6 <br>7 <br>8 <br>9 <br>10 <br>a <br><br>c <br>d <br>e <br>f <br>g <br>h <br>i <br>j <br>k <br>l <br>m <br><br>o <br><br>q <br>r <br><br>t <br>u <br>v <br>w <br>x <br>y <br>z <br>2.循环访问数组元素的两种方式: <br>2.1 for循环 <br><span style="CURSOR: pointer" onclick="doCopy('code77234')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->//range的第三个参数表示步长 <br>$numbers = range(1,10,2); <br>for($i = 0;$i<count($numbers); $i="" ++)="" <br="">{ <br>echo $numbers[$i].'<br>'; <br>} <br>?> <br> <br>output <br>1 <br>3 <br>5 <br>7 <br>9 <br>2.2 foreach循环 <br><span style="CURSOR: pointer" onclick="doCopy('code16755')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$letters = range('a','h',2); <br>foreach($letters as $letter) <br>{ <br>echo $letter.'<br>'; <br>} <br>?> <br> <br>output <br>a <br>c <br>e <br>g <br>Foreach还可以用来</li></ol></pre>输出数组的下标和对应的值 <br><span style="CURSOR: pointer" onclick="doCopy('code98192')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$letters = range('a','g',2); <br>foreach($letters as $key => $value) <br>{ <br>echo $key.'---'.$value.'<br>'; <br>} <br>?> <br> <br>output <br>0---a <br>1---c <br>2---e <br>3---g <br>3.is_array()函数，用于变量判断是否为一个数组 <br><span style="CURSOR: pointer" onclick="doCopy('code80438')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$numbers = range(1,10,2); <br>if(is_array($numbers)) <br>{ <br>foreach($numbers as $num) <br>{ <br>echo $num.'<br>'; <br>} <br>} <br>else <br>{ <br>echo $numbers; <br>} <br>?> <br> <br>4.print_r函数，打印关于变量的易于理解的信息 <br><span style="CURSOR: pointer" onclick="doCopy('code7142')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$usernames = array ('Jackie', 'Mary', 'Lucy', 'Bob', 'Mark', 'John' ); <br>print_r ( $usernames ); <br>?> <br> <br>output <br>Array ( [0] => Jackie [1] => Mary [2] => Lucy [3] => Bob [4] => Mark [5] => John ) <br>源代码里可以看到显示为： <br>Array <br>( <br>[0] => Jackie <br>[1] => Mary <br>[2] => Lucy <br>[3] => Bob <br>[4] => Mark <br>[5] => John <br>) <br>二．自定义键数组 <br>1.如果不想创建默认下标为零的数组，可以用如下方法，创建键为字符串的数组 <br><span style="CURSOR: pointer" onclick="doCopy('code27032')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->//初始化数组 <br>$userages = array('Jack'=> 23,'Lucy'=>25,'Mark'=>28); <br>//访问数组各元素 <br>echo $userages['Jack'].'<br>'; <br>echo $userages['Lucy'].'<br>'; <br>echo $userages['Mark'].'<br>'; <br>?> <br> <br>2.往自定义键数组里追加元素 <br><span style="CURSOR: pointer" onclick="doCopy('code93920')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->//初始化数组 <br>$ages = array('Jack'=>23); <br>//追加元素 <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>foreach($ages as $key => $value) <br>{ <br>echo $key.'----'.$value.'<br>'; <br>} <br>?> <br> <br>3.直接添加元素，无需创建数组。 <br><span style="CURSOR: pointer" onclick="doCopy('code93256')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->//不创建数组直接添加 <br>$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>foreach($ages as $key => $value) <br>{ <br>echo $key.'----'.$value.'<br>'; <br>} <br>?> <br> <br>4.循环打印数组foreach的使用 <br><span style="CURSOR: pointer" onclick="doCopy('code68689')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>foreach($ages as $key => $value) <br>{ <br>echo $key.'=>'.$value.'<br>'; <br>} <br>?> <br> <br>5. each() -- 返回数组中当前的键／值对并将数组指针向前移动一步 <br><span style="CURSOR: pointer" onclick="doCopy('code42390')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>$a = each($ages); <br>print_r($a); <br>echo '<br>'; <br>$a = each($ages); <br>print_r($a); <br>echo '<br>'; <br>$a = each($ages); <br>print_r($a); <br>?> <br> <br>用each()函数做循环打印 <br><span style="CURSOR: pointer" onclick="doCopy('code94729')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>while(!! $element = each($ages)) <br>{ <br>print_r($element); <br>echo '<br>'; <br>} <br>?> <br> <br>另一种打印方式 <br><span style="CURSOR: pointer" onclick="doCopy('code37713')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>while(!! $element = each($ages)) <br>{ <br>echo $element['key'].'=>'.$element['value']; <br>echo '<br>'; <br>} <br>?> <br> <br>6.list()函数的使用--把数组中的值赋给一些变量 <br><span style="CURSOR: pointer" onclick="doCopy('code61876')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>list($name,$age)= each($ages); <br>echo $name.'=>'.$age; <br>?> <br> <br>用list循环打印结果 <br><span style="CURSOR: pointer" onclick="doCopy('code89388')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>while(!!list($name,$age)= each($ages)) <br>{ <br>echo $name.'=>'.$age.'<br>'; <br>} <br>?> <br> <br>output <br>Jack=>23 <br>Lucy=>25 <br>Mark=>28 <br>7.reset()函数的使用--将数组的内部指针指向第一个单元 <br><span style="CURSOR: pointer" onclick="doCopy('code53735')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$ages['Jack']=23; <br>$ages['Lucy']=25; <br>$ages['Mark']=28; <br>each($ages); <br>each($ages); <br>list($name,$age)= each($ages); <br>echo $name.'=>'.$age.'<br>'; <br>//把数组重新设定到数组开始处 <br>reset($ages); <br>list($name,$age)= each($ages); <br>echo $name.'=>'.$age.'<br>'; <br>?> <br> <br>Output <br>Mark=>28 <br>Jack=>23 <br>8. array_unique() -- 移除数组中重复的值 <br><span style="CURSOR: pointer" onclick="doCopy('code87252')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$nums = array(1,2,3,4,5,6,5,4,3,2,1,1,2,3,4,5,6); <br>//返回一个不包含重复值的数组 <br>$result = array_unique($nums); <br>print_r($result); <br>?> <br>Output <br>Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) <br>9. array_flip ()-- 交换数组中的键和值 <br><!--?php <BR-->$userages = array('Jack'=> 23,'Lucy'=>25,'Mark'=>28); <br>$ages = array_flip($userages); <br>print_r($ages); <br>?> <br> <br>output <br>Array ( [23] => Jack [25] => Lucy [28] => Mark ) <br>三．数组里的数组 <br>数组里不一定就是一个关键字和值的列表，数组里也可以放入数组 <br><span style="CURSOR: pointer" onclick="doCopy('code60144')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$produces = array( <br>array('apple',6,28.8), <br>array('pear',3,15.6), <br>array('banana',10,4.6) <br>); <br>echo $produces[0][0].'|'.$produces[0][1].'|'.$produces[0][2].'<br>'; <br>echo $produces[1][0].'|'.$produces[1][1].'|'.$produces[1][2].'<br>'; <br>echo $produces[2][0].'|'.$produces[2][1].'|'.$produces[2][2].'<br>'; <br>?> <br> <br>output <br>apple|6|28.8 <br>pear|3|15.6 <br>banana|10|4.6 <br>用for循环打印数组中的数组 <br><span style="CURSOR: pointer" onclick="doCopy('code68025')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$produces = array ( <br>array ('apple', 6, 28.8 ), <br>array ('pear', 3, 15.6 ), <br>array ('banana', 10, 4.6 ) <br>); <br>for($i = 0; $i < count ( $produces ); $i ++) <br>{ <br>for($j = 0; $j < count ( $produces [$i] ); $j ++) <br>{ <br>echo '|' . $produces[$i][$j]; <br>} <br>echo '<br>'; <br>} <br>?> <br> <br>output <br>|apple|6|28.8 <br>|pear|3|15.6 <br>|banana|10|4.6 <br>二维数组 <br><span style="CURSOR: pointer" onclick="doCopy('code17823')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$produces = array ( <br>array ('name' => 'apple', 'amount' => 6, 'price' => 28.8 ), <br>array ('name' => 'pear', 'amount' => 3, 'price' => 15.6 ), <br>array ('name' => 'banana', 'amount' => 10, 'price' => 4.6 ) <br>); <br>while(!!List($key,$value)=each($produces)) <br>{ <br>while(!!list($key2,$value2)=each($value)) <br>{ <br>echo '|'.$key2.'=>'.$value2; <br>} <br>echo '<br>'; <br>} <br>?> <br> <br>output <br>|name=>apple|amount=>6|price=>28.8 <br>|name=>pear|amount=>3|price=>15.6 <br>|name=>banana|amount=>10|price=>4.6 <br>用foreach来打印则更容易（推荐） <br><span style="CURSOR: pointer" onclick="doCopy('code94988')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$produces = array ( <br>array ('name' => 'apple', 'amount' => 6, 'price' => 28.8 ), <br>array ('name' => 'pear', 'amount' => 3, 'price' => 15.6 ), <br>array ('name' => 'banana', 'amount' => 10, 'price' => 4.6 ) <br>); <br>foreach($produces as $key1 => $value1) <br>{ <br>foreach($value1 as $key2 => $value2) <br>{ <br>echo '|'.$key2.'=>'.$value2; <br>} <br>echo '<br>'; <br>} <br>?> <br> <br>output <br>|name=>apple|amount=>6|price=>28.8 <br>|name=>pear|amount=>3|price=>15.6 <br>|name=>banana|amount=>10|price=>4.6 <br>四．数组的排序 <br>1.Sort()函数对英文的排序 <br><span style="CURSOR: pointer" onclick="doCopy('code90051')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('lemo','banana','apple','pear'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>sort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [0] => lemo [1] => banana [2] => apple [3] => pear ) <br>排序后的数组：Array ( [0] => apple [1] => banana [2] => lemo [3] => pear ) <br>2.Sort()函数对中文的排序 <br><span style="CURSOR: pointer" onclick="doCopy('code78302')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('柠檬','香蕉','苹果','梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>sort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>Output: <br>原始的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>排序后的数组：Array ( [0] => 柠檬 [1] => 梨子 [2] => 苹果 [3] => 香蕉 ) <br>3. asort -- 对数组进行排序并保持索引关系 <br><span style="CURSOR: pointer" onclick="doCopy('code13550')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>asort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>排序后的数组：Array ( [a] => 柠檬 [d] => 梨子 [c] => 苹果 [b] => 香蕉 ) <br>4. ksort -- 对数组按照键名排序 <br><span style="CURSOR: pointer" onclick="doCopy('code7805')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('b'=>'柠檬','a'=>'香蕉','d'=>'苹果','c'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>ksort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [b] => 柠檬 [a] => 香蕉 [d] => 苹果 [c] => 梨子 ) <br>排序后的数组：Array ( [a] => 香蕉 [b] => 柠檬 [c] => 梨子 [d] => 苹果 ) <br>5. rsort -- 对数组逆向排序 <br><span style="CURSOR: pointer" onclick="doCopy('code51599')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('柠檬','香蕉','苹果','梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>rsort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>排序后的数组：Array ( [0] => 香蕉 [1] => 苹果 [2] => 梨子 [3] => 柠檬 ) <br>6. arsort -- 对数组进行逆向排序并保持索引关系 <br><span style="CURSOR: pointer" onclick="doCopy('code93660')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>arsort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>排序后的数组：Array ( [b] => 香蕉 [c] => 苹果 [d] => 梨子 [a] => 柠檬 ) <br>7. krsort -- 对数组按照键名逆向排序 <br><span style="CURSOR: pointer" onclick="doCopy('code40917')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>krsort($fruits); <br>echo '排序后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>排序后的数组：Array ( [d] => 梨子 [c] => 苹果 [b] => 香蕉 [a] => 柠檬 ) <br>8. shuffle -- 将数组打乱 <br><span style="CURSOR: pointer" onclick="doCopy('code52262')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>shuffle($fruits); <br>echo '打乱后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>打乱后的数组：Array ( [0] => 香蕉 [1] => 苹果 [2] => 柠檬 [3] => 梨子 ) <br>9. array_reverse -- 返回一个单元顺序相反的数组 <br><span style="CURSOR: pointer" onclick="doCopy('code44785')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>$fruits = array_reverse($fruits); <br>echo '反转后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>反转后的数组：Array ( [d] => 梨子 [c] => 苹果 [b] => 香蕉 [a] => 柠檬 ) <br>10. array_unshift -- 在数组开头插入一个或多个单元 <br><span style="CURSOR: pointer" onclick="doCopy('code67216')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>array_unshift($fruits,'杮子'); <br>echo '插入后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>插入后的数组：Array ( [0] => 杮子 [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>11. array_shift -- 将数组开头的单元移出数组 <br><span style="CURSOR: pointer" onclick="doCopy('code73366')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array('a'=>'柠檬','b'=>'香蕉','c'=>'苹果','d'=>'梨子'); <br>echo '原始的数组：'; <br>print_r($fruits); <br>echo '<br>'; <br>array_shift($fruits); <br>echo '移出后的数组：'; <br>print_r($fruits); <br>?> <br> <br>output <br>原始的数组：Array ( [a] => 柠檬 [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>移出后的数组：Array ( [b] => 香蕉 [c] => 苹果 [d] => 梨子 ) <br>12. array_rand -- 从数组中随机取出一个或多个单元 <br><span style="CURSOR: pointer" onclick="doCopy('code1801')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array ('柠檬', '香蕉', '苹果', '梨子' ); <br>echo '原始的数组：'; <br>print_r ( $fruits ); <br>echo '<br>'; <br>$newArr_key = array_rand ( $fruits, 2 ); <br>echo '随机后的数组：'; <br>echo $fruits [$newArr_key [0]].' '; <br>echo $fruits [$newArr_key [1]]; <br>?> <br> <br>output <br>原始的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>随机后的数组：梨子 苹果 <br>13. array_pop -- 将数组最后一个单元弹出（出栈） <br><span style="CURSOR: pointer" onclick="doCopy('code43054')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array ('柠檬', '香蕉', '苹果', '梨子' ); <br>echo '原始的数组：'; <br>print_r ( $fruits ); <br>echo '<br>'; <br>array_pop ( $fruits ); <br>echo '弹出后的数组：'; <br>print_r ( $fruits ); <br>?> <br> <br>Output: <br>原始的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>弹出后的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 ) <br>14. array_push -- 将一个或多个单元压入数组的末尾（入栈） <br><span style="CURSOR: pointer" onclick="doCopy('code45854')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><!--?php <BR-->$fruits = array ('柠檬', '香蕉', '苹果', '梨子' ); <br>echo '原始的数组：'; <br>print_r ( $fruits ); <br>echo '<br>'; <br>array_push ( $fruits,'杮子'); <br>echo '弹出后的数组：'; <br>print_r ( $fruits ); <br>?> <br> <br>Output: <br>原始的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>弹出后的数组：Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 [4] => 杮子 ) <br>五．数组的指针的操作 <br>each -- 返回数组中当前的键／值对并将数组指针向前移动一步 <br>current -- 返回数组中的当前单元 <br>reset -- 将数组的内部指针指向第一个单元 <br>end -- 将数组的内部指针指向最后一个单元 <br>next -- 将数组中的内部指针向前移动一位 <br>pos -- current() 的别名 <br>prev -- 将数组的内部指针倒回一位 <br><meta http-equiv="content-type" content="text/html;charset=utf-8"> <br><span style="CURSOR: pointer" onclick="doCopy('code64012')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$fruits = array ('柠檬', '香蕉', '苹果', '梨子' ); <br>print_r ( $fruits ); <br>echo '<br>'; <br>echo 'each() : '; <br>print_r ( each ( $fruits ) ); <br>echo '<br>'; <br>echo 'current() : '; <br>echo (current ( $fruits )); <br>echo '<br>'; <br>echo 'next() : '; <br>echo (next ( $fruits )); <br>echo '<br>'; <br>echo 'end() : '; <br>echo (end ( $fruits )); <br>echo '<br>'; <br>echo 'prev() : '; <br>echo (prev ( $fruits )); <br>echo '<br>'; <br>echo 'pos() : '; <br>echo (pos ( $fruits )); <br>echo '<br>'; <br>?> <br> <br>Output: <br>Array ( [0] => 柠檬 [1] => 香蕉 [2] => 苹果 [3] => 梨子 ) <br>each() : Array ( [1] => 柠檬 [value] => 柠檬 [0] => 0 [key] => 0 ) <br>current() : 香蕉 <br>next() : 苹果 <br>end() : 梨子 <br>prev() : 苹果 <br>pos() : 苹果 <br>六．统计数组个数 <br>count -- 计算数组中的单元数目或对象中的属性个数 <br>sizeof -- count() 的别名 <br>array_count_values -- 统计数组中所有的值出现的次数 <br><span style="CURSOR: pointer" onclick="doCopy('code82979')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$nums = array (1, 3, 5, 1, 3, 4, 5, 65, 4, 2, 2, 1, 4, 4, 1, 1, 4, 1, 5, 4, 5, 4 ); <br>echo count ( $nums ); <br>echo '<br>'; <br>echo sizeof ( $nums ); <br>echo '<br>'; <br>$arrayCount = array_count_values ( $nums ); <br>print_r ( $arrayCount ); <br>?> <br> <br>output <br>22 <br>22 <br>Array ( [1] => 6 [3] => 2 [5] => 4 [4] => 7 [65] => 1 [2] => 2 ) <br>七．将数组转换成标量变量：extract() <br>把数组中的每个元素转换成变量，变量名是数组元素的key,变量值为数组元素的value. <br><span style="CURSOR: pointer" onclick="doCopy('code72961')"><u></u></span> 代码如下:<pre class="brush:php;toolbar:false layui-box layui-code-view layui-code-notepad"><ol class="layui-code-ol"><li><br><!--?php <BR-->$fruits = array('a'=>'apple','b'=>'banana','o'=>'orange'); <br>extract($fruits); <br>echo $a.'<br>'; <br>echo $b.'<br>'; <br>echo $o.'<br>'; <br>?> <br> <br>output <br>apple <br>banana <br>orange <br></li><li><p></p></li><li><p align="left"><span id="url" itemprop="url">http://www.bkjia.com/PHPjc/324807.html</span><span id="indexUrl" itemprop="indexUrl">www.bkjia.com</span><span id="isOriginal" itemprop="isOriginal">true</span><span id="isBasedOnUrl" itemprop="isBasedOnUrl">http://www.bkjia.com/PHPjc/324807.html</span><span id="genre" itemprop="genre">TechArticle</span><span id="description" itemprop="description">一．什么是数组 数组是一组有某种共同特性的元素，包括相似性和类型。 每个元素由一个特殊的标识符来区分，称之为key，而每个key都有一...</span></p></li><li>                    </li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></li></ol></pre></count($numbers);></li></ol></pre></li></ol></pre>