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;

1	$str=‘123/456/789/abc‘;

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

1	echosubstr($str,0,strpos($str, ‘/‘))

Or

123	$array=explode(‘/‘, $str);echo$array[0];// 输出 123

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

12	echosubstr($str,strpos($str,‘/‘)+1);//输出 456/789/abc

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

1	echotrim(strrchr($str, ‘/‘),‘/‘);

Or if you know the number of slashes

123	$array=explode(‘/‘, $str);echo$array[3];//输出 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;

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/** * 按符号截取字符串的指定部分 * @param string $str 需要截取的字符串 * @param string $sign 需要截取的符号 * @param int $number 如是正数以0为起点从左向右截  负数则从右向左截 * @return string 返回截取的内容 */functioncut_str($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];        }    }else{        if($number>=$length){            return‘error‘;        }else{            return $array[$number];        }    }}

Example:

1234	echocut_str($str,‘/‘,0); //输出 123echocut_str($str,‘/‘,2); //输出 789echocut_str($str,‘/‘,-1);//输出 abcechocut_str($str,‘/‘,-3);//输出 456

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

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PHP intercepts the specified part of a string by symbol