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php常用数组函数查询手册php中的数组php打印数组php声明数

时间:2021-07-01 10:21:17 帮助过:27人阅读

php数组常用函数

  • array_map ( callable callback,arrayarr1 [, array $… ] )

返回一个数组,该数组包含了 arr1 中的所有单元经过 callback 作用过之后的单元。 callback 接受的参数数目应该和传递给 array_map() 函数的数组数目一致。

  1. <code><span>/*例1*/</span><span><!--?php</span--><span><span>function</span><span>cube</span><span>( <span>$n</span> )</span>
  2. {</span><span>return</span>( <span>$n</span> * <span>$n</span> * <span>$n</span> );
  3. }
  4. <span>$a</span> = <span>array</span>( <span>1</span> , <span>2</span> , <span>3</span> , <span>4</span> , <span>5</span> );
  5. <span>$b</span> = array_map ( <span>"cube"</span> , <span>$a</span> );
  6. print_r ( <span>$b</span> );
  7. <span>/**
  8. </span></span></code>
输出 Array ( [0] => 1 [1] => 8 [2] => 27 [3] => 64 [4] => 125 ) **/?>
  1. <code><span><!--?php</span--><span>/*例2*/</span><span>/*将多个数组进行合并*/</span><span>$a</span> = <span>array</span>( <span>1</span> , <span>2</span> , <span>3</span> , <span>4</span> , <span>5</span> );
  2. <span>$b</span> = <span>array</span>( <span>"one"</span> , <span>"two"</span> , <span>"three"</span> , <span>"four"</span> , <span>"five"</span> );
  3. <span>$c</span> = <span>array</span>( <span>"uno"</span> , <span>"dos"</span> , <span>"tres"</span> , <span>"cuatro"</span> , <span>"cinco"</span> );
  4. <span>$d</span> = array_map ( <span>null</span> , <span>$a</span> , <span>$b</span> , <span>$c</span> );
  5. print_r ( <span>$d</span> );
  6. <span>/*</span></span></code>
输出 Array ( [0] => Array ( [0] => 1 [1] => one [2] => uno ) [1] => Array ( [0] => 2 [1] => two [2] => dos ) [2] => Array ( [0] => 3 [1] => three [2] => tres ) [3] => Array ( [0] => 4 [1] => four [2] => cuatro ) [4] => Array ( [0] => 5 [1] => five [2] => cinco ) ) */?>
  • range ( mixed start,mixedlimit [, number $step = 1 ] )

step表示间隔值,不写默认为1

  1. <code><span>/*
  2. 例1,产生一组数字
  3. */</span><span>$nums</span> = range(<span>1</span>, <span>5</span>);
  4. print_r(<span>$nums</span>);
  5. <span>/*
  6. </span></code>
输出: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 ) */$nums = range(1, 5, 2); print_r($nums); /* 输出: Array ( [0] => 1 [1] => 3 [2] => 5 ) */
  1. <code><span>/*
  2. 例2,产生一组字母数组
  3. */</span><span>$array</span> = range(<span>'a'</span>,<span>'f'</span>);
  4. print_r(<span>$array</span>);
  5. <span>/*
  6. </span></code>
输出: Array ( [0] => a [1] => b [2] => c [3] => d [4] => e [5] => f ) */$array = array('a', 'f', 2); print_r($array); /* 输出: print_r($array); /* 输出: Array ( [0] => a [1] => c [2] => e ) */
  • array_merge ( array array1[,array… ] )

array_merge() 将一个或多个数组的单元合并起来,一个数组中的值附加在前一个数组的后面。返回作为结果的数组。

如果输入的数组中有相同的字符串键名,则该键名后面的值将覆盖前一个值。然而,如果数组包含数字键名,后面的值将不会覆盖原来的值,而是附加到后面。

如果只给了一个数组并且该数组是数字索引的,则键名会以连续方式重新索引。

  1. <code><span>/*
  2. 解释:如果只给了一个数组并且该数组是数字索引的,则键名会以连续方式重新索引。
  3. */</span><span>$array1</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>3</span>, <span>4</span>, <span>5</span>);
  4. <span>$array2</span> = <span>array</span>(<span>1</span>, <span>2</span>, <span>8</span>, <span>9</span>);
  5. <span>$array3</span> = array_merge(<span>$array1</span>, <span>$array2</span>);
  6. print_r(<span>$array3</span>);
  7. <span>/*
  8. </span></code>
输出: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 1 [6] => 2 [7] => 8 [8] => 9 ) */
  • array_merge_recursive ( array array1[,array… ] ) 递归地合并一个或多个数组

如果输入的数组中有相同的字符串键名,则这些值会被合并到一个数组中去,这将递归下去,因此如果一个值本身是一个数组,本函数将按照相应的条目把它合并为另一个数组。然而,如果数组具有相同的数组键名,后一个值将不会覆盖原来的值,而是附加到后面。

会根据键名相同一层一层的将值进行合并

  1. <code><span>/*
  2. 例1
  3. */</span><span>$ar1</span> = <span>array</span>(<span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>"red"</span>), <span>5</span>);
  4. <span>$ar2</span> = <span>array</span>(<span>10</span>, <span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>array</span>(<span>'a'</span>=><span>"red"</span>), <span>"blue"</span>));
  5. <span>$result</span> = array_merge_recursive(<span>$ar1</span>, <span>$ar2</span>);
  6. print_r(<span>$result</span>);
  7. <span>/*
  8. </span></code>
输出: Array ( [color] => Array ( [favorite] => Array ( [0] => red [a] => red 重点 ) [0] => blue ) [0] => 5 [1] => 10 ) */
  1. <code><span>/*
  2. 例2
  3. */</span><span>$ar1</span> = <span>array</span>(<span>"color"</span> => <span>array</span>(<span>"favorite"</span> => <span>"red"</span>), <span>5</span>);
  4. <span>$ar2</span> = <span>array</span>(<span>10</span>, <span>"color"</span> => <span>array</span>(<span>"favorite"</span> =><span>"red"</span>, <span>"blue"</span>));
  5. <span>$result</span> = array_merge_recursive(<span>$ar1</span>, <span>$ar2</span>);
  6. print_r(<span>$result</span>);
  7. <span>/*
  8. </span></code>
输出: Array ( [color] => Array ( [favorite] => Array ( [0] => red [1] => red 重点 ) [0] => blue ) [0] => 5 [1] => 10 ) */
  • array_pad ( array input,intpad_size , mixed $pad_value ) 给数组增加值到指定的长度,原数组不会改变
  1. <code><span><!--?php</span--><span>$input</span> = <span>array</span>(<span>12</span>, <span>10</span>, <span>9</span>);
  2. <span>$result</span> = array_pad(<span>$input</span>, <span>5</span>, <span>0</span>);
  3. <span>// result is array(12, 10, 9, 0, 0)</span><span>$result</span> = array_pad(<span>$input</span>, -<span>7</span>, -<span>1</span>);
  4. <span>// result is array(-1, -1, -1, -1, 12, 10, 9)</span><span>$result</span> = array_pad(<span>$input</span>, <span>2</span>, <span>"noop"</span>);
  5. <span>// not padded</span><span>/*
  6. 如果size<数组的长度,将不会有变化
  7. */</span><span>?></span></span></code>

  • array_pop ( array &$array ) 移出最后一个元素,原数组会改变

array_pop() 弹出并返回 array 数组的最后一个单元,并将数组 array 的长度减一。 如果 array 为空(或者不是数组)将返回 NULL 。 此外如果被调用不是一个数则会产生一个 Warning。

  1. <code><span><!--?php</span--><span>$stack</span> = <span>array</span>(<span>"orange"</span>, <span>"banana"</span>, <span>"apple"</span>, <span>"raspberry"</span>);
  2. <span>$fruit</span> = array_pop(<span>$stack</span>);
  3. print_r(<span>$stack</span>);
  4. <span>?></span><span>/*
  5. </span></span></code>
输出 Array ( [0] => orange [1] => banana [2] => apple ) */
  • array_shift() 将数组开头的单元移出数组,原数组会改变, 使用此函数后会重置(reset())array 指针。

array_shift() 将 array 的第一个单元移出并作为结果返回,将 array 的长度减一并将所有其它单元向前移动一位。所有的数字键名将改为从零开始计数,文字键名将不变。 如果 array 为空(或者不是数组)将返回 NULL

  • array_push()

  • reset()

  • end()

  • test() 格式化输出数组

  • array_rand()

  • array_replace()

  • array_reverse()

  • array_sum()

  • sort() 将值排序完成后,会是一个索引数组,即便原来是一个关联数组

  • usort()

  • rsort()

  • ksort()

  • krsort()

  • uksort()

  • asort()

  • arstor()

  • in_array()

  • array_splice()

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