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phpecho输出字符串函数详解

时间:2021-07-01 10:21:17 帮助过:18人阅读

echo "asd";//字符串 
echo "ads$c";//字符串+变量 
echo 'ads$c';//字符串 asd$c $c不是变量 
echo "sd"."vs"; 
echo "sd","vs"; 
echo $a; 
echo $a.$b; 
echo $a,$b; 
echo $a.$b.$c; 
echo $a,$b,$c; 
echo "kaskd{$c}asd"; 
echo "kakskd{$arr['lo']}"; 
echo "kakskd{$obj->a}"; 
echo "kaskd".$c."kasd"; 
echo "kaskd".$arr['lo']."kasd"; 
echo "kaskd".$obj->a."kasd"; 
echo "kaskd".func($c)."kasd"; 
echo "kaksk".($a+1)."dkkasd"; 
echo $c."jaksd"; 
echo $c,"jaksd"; 
//php多行
输出方法 echo <<<END This uses the "here document" syntax to output END; //输出简写 <?php echo $a;?>   <?=$a?>
<?php 
echo "Hello World"; 

echo "This spans 
multiple lines. The newlines will be 
output as well"; 

echo "This spans\nmultiple lines. The newlines will be\noutput as well."; 

echo "Escaping characters is done \"Like this\"."; 

// You can use variables inside of an echo statement 
$foo = "foobar"; 
$bar = "barbaz"; 

echo "foo is $foo"; // foo is foobar 

// You can also use arrays 
$baz = array("value" => "foo"); 

echo "this is {$baz['value']} !"; // this is foo ! 

// Using single quotes will print the variable name, not the value 
echo 'foo is $foo'; // foo is $foo 

// If you are not using any other characters, you can just echo variables 
echo $foo; // foobar 
echo $foo,$bar; // foobarbarbaz 

// Some people prefer passing multiple parameters to echo over concatenation. 
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10); 
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n"; 

echo <<<END 
This uses the "here document" syntax to output 
multiple lines with $variable interpolation. Note 
that the here document terminator must appear on a 
line with just a semicolon. no extra whitespace! 
END; 

// Because echo does not behave like a function, the following code is invalid. 
($some_var) ? echo 'true' : echo 'false'; 

// However, the following examples will work: 
($some_var) ? print 'true' : print 'false'; // print is also a construct, but 
// it behaves like a function, so 
// it may be used in this context. 
echo $some_var ? 'true': 'false'; // changing the statement around 
?>

以下是官方手册说明:
Definition and Usage
定义和用法
The echo() function outputs one or more strings.
echo()函数的作用是:输出一个或多个字符串。
Syntax
语法
echo(strings)
Parameter参数 Description描述
strings Required. One or more strings to be sent to the output
必要参数。指定一个或多个需要被发送到结果中的字符串
Tips and Notes
提示和注意点
Note: The echo() function is not actually a function, so you are not required to use parentheses with it. However, if you want to pass more than one parameter to echo(), using parentheses will generate a parse error.
注意:echo()函数不是一个真正意义上的函数,所以你没有必要一定去使用它。如果你想把多于一个的参数传递给echo()函数,那么使用圆括号“()”将产生错误。
Tip: The echo() function is slightly faster than print().
提示:echo()函数相当于print()函数的简化版本。
Tip: The echo() function has the following shortcut syntax. See example 5.
提示:echo()函数包含下面的简便写法。具体见:案例5。
Example 1
案例1

<?php 
$str = "Who's Kai Jim?"; 
echo $str; 
echo "<br />"; 
echo $str."<br />I don't know!"; 
?>

The output of the code above will be:
上述代码将输出下面的结果:
Who's Kai Jim?Who's Kai Jim?I don't know!

Example 2
案例2

<?php 
echo "This textspans multiplelines."; 
?>

The output of the code above will be:
上述代码将输出下面的结果:
This text spans multiple lines.

Example 3
案例3

<?php 
echo 'This ','string ','was ','made ','with multiple parameters'; 
?>

The output of the code above will be:
上述代码将输出下面的结果:
This string was made with multiple parameters

Example 4
案例4
Difference of single and double quotes. Single quotes will print the variable name, not the value:
区别单引号(')和双引号(”)的不同。单引号将输出变量名,而不是变量的值:

<?php 
$color = "red"; 
echo "Roses are $color"; 
echo "<br />"; 
echo 'Roses are $color'; 
?>

The output of the code above will be:
上述代码将输出下面的结果:
Roses are redRoses are $color

Example 5
案例5
Shortcut syntax:
简写(捷径)语法:

<html><body> 
<?php 
$color = "red"; 
?><p>Roses are <?=$color?></p></body></html>

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