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Use of "PHP Basics" delimiters

2022-07-27 08:10:00 【Go home at night】

Functional requirements

Use the delimiter to output a string , The string contains a variable , And the value of the variable . Delimiters are no different from double quotes , The included variables are also replaced with actual values .

The sample code 

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title> Use delimiters to define strings </title>

</head>



<body>

<?php

    $i = ' Show the contents of this line ';

    echo <<<std

     This is no different from double quotation marks ,\$i It can also be output .<p>

    \$i The content is ：$i

std;

?>

</body>

Running results

 

 

Functional requirements

PHP Support use JavaScript code . Save a segment by defining a string with a delimiter JavaScript Code , And dynamic output JavaScript Code .

The sample code 

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title> Use delimiters to output JavaScript sentence </title>

</head>



<body>

<?php

  $str = <<<mark

  <script language = "javascript" type = "text/javascript">

    alert(" Welcome to PHP The world ！！！");

  </script>

mark;

  echo $str;

?>

</body>

Running results

 

 

Knowledge description

delimiter （<<<） from PHP4.0 Start supported . When used, it is followed by an identifier , Then there's the string , Finally, the same identifier ends the string . The format of the delimiter is as follows ：

$string = <<<str

String content

str： among str Identifier specified for .

Be careful ： The end identifier must be on a separate line , And spaces are not allowed . Errors will also occur if there are other matches or characters before and after the identifier .

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版权声明
本文为[Go home at night]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/208/202207270502440657.html

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