PHP intercepts the specified part of a string by symbol

String interception is more commonly used in PHP development, and there are many requirements for interception, such as the operation of a URL link: http://www.baijunyao.com/index.php/Home/Index/article/aid/12

Sometimes we want to intercept the last slash '/' behind the number;

Sometimes we need to intercept the first slash '/' in front of the content to determine the user Input URL link without http:/, and so on;

There are many ways to intercept PHP's built-in functions in a string, simply write a few examples;

$str = ' 123/456/789/abc ';

You can do this by intercepting the contents of the first slash :

Echo substr ($str, 0,strpos ($str, '/'))

Or

$array =explode ('/', $str); Echo $array [0];//output 123

You can do this by intercepting the contents of the first slash :

Echo substr ($str, Strpos ($str, '/') +1);//Output 456/789/ABC

To intercept the contents of the last slash , you can do the following:

Echo Trim (STRRCHR ($str, '/'), '/');

Or if you know the number of slashes

$array =explode ('/', $str); Echo $array [3];//output ABC

But if you don't know how many slashes there are? What if you want the middle of a second slash and a third slash?

The following I wrote this function can be easily resolved as above all problems;

/** *  the specified portion of a string by symbol  *  @param  string  $str   string to intercept  *  @param   string  $sign   Symbols to be intercepted  *  @param  int  $number   If positive starts from left to right from 0 Negative numbers are cut from right to left  *  @return  string  return intercepted content  */function cut_str ($str, $sign, $number) {      $array =explode ($sign,  $str);     $length =count ($array);     if ($number <0) {         $new _array=array_reverse ($array);          $abs _number=abs ($number);         if ($abs _number> $length) {             return  ' ERROR ';        }else{             return  $new _array[$abs _number-1];         } &Nbsp;  }else{        if ($number >= $length) {             return  ' ERROR ';         }else{            return $ array[$number];        }    }}

Example:

Echo cut_str ($str, '/', 0); Output 123echo cut_str ($str, '/', 2); Output 789echo cut_str ($str, '/',-1);//Output Abcecho cut_str ($str, '/',-3);//Output 456

How to use this function to intercept the specified part of the content is strong enough;

650) this.width=650; "alt=" 1.jpg "src=" http://www.baijunyao.com/Upload/image/ueditor/20150504/1430670684582054. JPG "title=" 1430670684582054.jpg "/>

This article is from the "Bai Jun Remote Blog" blog, please be sure to keep this source http://shuaibai123.blog.51cto.com/10163353/1686248

PHP intercepts the specified part of a string by symbol