php echo 输出字符串函数详解 |
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本文标签：php,echo,输出字符串 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 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 复制代码 代码如下: <?php $str = "Whos Kai Jim?"; echo $str; echo "<br />"; echo $str."<br />I dont know!"; ?> The output of the code above will be: 上述代码将输出下面的结果： Whos Kai Jim?Whos Kai Jim?I dont 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> |
