PHP正则表达式功能强大，本范例演示了preg_replace_callback函数的用法，PHP正则preg_replace_callback函数的用法，感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：

/**
 * preg_replace_callback函数的用法
 *
 * @param 
 * @arrange (512.笔记) jb51.cc
 **/
$Text  = "Title: Hello world!\n";
$Text .= "Author: Jonas\n";
$Text .= "This is a example message!\n\n";
$Text .= "Title: Entry 2\n";
$Text .= "Author: Sonja\n";
$Text .= "Hello world,what's up!\n";
 
// This function will replace specific matches
// into a new form
function RewriteText($Match){
 
    // Entire matched section: 
    // --> /.../
    $EntireSection  = $Match[0];
    // --> "\nTitle: Hello world!"
 
    // Key 
    // --> ([a-z0-9]+)
    $Key            = $Match[1];
    // --> "Title"
 
    // Value 
    // --> ([^\n\r]+)
    $Value        = $Match[2];
    // --> "Hello world!"
 
    // Add some bold (<b>) tags to around the key to三.零.网 jb51.cc
    return '<b>' . $Key . '</b>: ' . $Value;
}
 
// The regular expression will extract and pass all "key: value" pairs to
// the "RewriteText" function that is definied above
$NewText = preg_replace_callback('/[\r\n]([a-z0-9]+): ([^\n\r]+)/i',"RewriteText",$Text);
 
// Print the new modified text
print $NewText;


/***   来自编程之家 jb51.cc（jb51.cc）   ***/