PHP intercepts the contents before and after the specified string

Suppose there is now a string as follows ：

$string = '  Ha ha ha ha  anbin  learning  php  Hey, hey, hey  ';

Demand is , You need to put the string anbin Remove from the string , The result of the string is ：' Hahaha, learning php Hey, hey, hey '.

At first glance, it's actually very simple , Use it directly php Built in functions str_replace () that will do .
The method is as follows :

echo str_replace('anbin','',$string); 

But now I want to get the string anbin Previous string : ' Ha ha ha ha ' And string anbin String after : ' learning php Hey, hey, hey '. Now str_replace () Can't meet the demand , What to do ？
The method is as follows :

/*
@param $string        A string of strings 
@param $removeStr    $string A string contained in 
*/
function getRemoveStr($string,$removeStr){
    
    $prevSeat = strpos($string,$removeStr);    // obtain $remove stay $string  Position in 
    
    $prevString = substr($string,0,$prevSeat);  // Intercept from the beginning to $remove Previous string 

    $zongSeat = $prevSeat + strlen($removeStr); // Splicing a wave $removeStr The character length of itself gets the starting position of the string to be intercepted in the second half 
     
    $nextString = substr($string,$zongSeat);   // The string intercepted from the beginning to the end of the second half of the string 
    
    $endString = $prevString . $nextString;    // hold $removerStr Previous string and $removerStr The following strings are spliced , Get rid of $removerStr String other than 
    
    return $endString;
}

echo getRemoveStr($string,'anbin');  

This method can not only get character string anbin Previous string , You can also get character string anbin String after , It can also be spliced . Although the efficiency is slower than the first , But the function is really rich . Finally, you need to meet your own needs , Make a wheel by yourself ！