Interpreting the array substitution code example for PHP function preg_replace () _php Tutorial

php function Preg_replace () Prototype: Mixed preg_replace (mixed $pattern, mixed $replacement, mixed $subject [, int $limit])

The PHP function Preg_replace () is more powerful than the C function. The first three parameters can be used arrays, the fourth parameter $limit can set the number of substitutions, the default is to replace all. Code 6.7 is an application instance of an array substitution.

php function Preg_replace () code 6.7 array substitution

 
 

  
  

  
< ? PHP
  
  

  
String
  
  

  
$ string  =  "Name: {name}< br>nemail:
{email}< br>naddress: {address}< br>n "; 
  
  

  
Mode
  
  

  
$ Patterns  = Array ( 
  
  

  
"/{address}/",
  
  

  
"/{name}/",
  
  

  
"/{email}/"
  
  

  
);
  
  

  
Replace string
  
  

  
$ Replacements  =  Array  ( 
  
  

  
"No.5, Wilson St., New York, U.S.A",
  
  

  
"Thomas Ching",
  
  

  
"Tom@emailaddress.com",
  
  

  
);
  
  

  
Output mode substitution results
  
  

  
Print Preg_replace ($patterns,
$replacements, $string);
  
  

  
?>  
 
 

The output results are as follows.

Name:thomas Ching ",
Email:tom@emailaddress.com
Address:no.5, Wilson St., New York, U.S.A
The pattern modifier "E" can be used in preg_replace regular expressions. The effect is to use the match result as an expression, and it can be re-calculated. For example:

 
 

  
  

  
< ? PHP
  
  

  
$ Html_body  = 
  
  

  
" <   HTML>
  
  

  
<   Body>
  
  

  
<   H1>TEST<  /h1>
  
  

  
My Picture < Img   src= "my.gif">
  
  

  
< /body >
  
  

  
< /html > "; 
  
  

  
The HTML tags in the output will all be lowercase letters
  
  

  
Echo Preg_replace (
  
  

  
"/(<  /?) (w+) (^>]* > )/E ",
  
  

  
"' \1 '. Strtolower (' \2 '). ' \3 ' ",//mode variable here
\2 will be converted to lowercase characters by strtolower
  
  

  
$html _body);
  
  

  
?>  
 
 

The above is the PHP function preg_replace () of the specific use of the introduction, I hope to be helpful to everyone.

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