php echo 输出字符串函数详解
php echo 输出字符串函数详解
发布时间:2016-12-29 来源:查字典编辑
摘要:复制代码代码如下:echo"asd";//字符串echo"ads$c";//字符串+变量echo'ads$c';//字符串asd$c$c不是...

复制代码 代码如下:

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?>

复制代码 代码如下:

<?php

echo "Hello World";

echo "This spans

multiple lines. The newlines will be

output as well";

echo "This spansnmultiple lines. The newlines will benoutput 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

复制代码 代码如下:

<?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

复制代码 代码如下:

<?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

复制代码 代码如下:

<?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:

复制代码 代码如下:

<?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:

复制代码 代码如下:

<html><body>

<?php

$color = "red";

?><p>Roses are <?=$color?></p></body></html>

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