The simplest string matching algorithm in php, php matching algorithm_PHP tutorial

/*
The simplest string matching algorithm php implementation

T: ababcabc
P: abc

0. ababcabc ababcabc ababcabc
|||    |||    |||
abc abc abc
(X)       (X)       (O)

3. 4. 5.
ababcabc ababcabc ababcabc
 
|||    |||    |||
 
abc abc abc
 
(X)       (X)       (O)
*/

$str="ababcabc";
$search="abc";

$strlen=strlen($str);
$searchlen=strlen($search);

//1. Traverse $str string
for($i=0;$i<$strlen;$i++){
If($i+$searchlen>$strlen){
echo 'Exceeds length';break;
}

$match=true;

​  
//2. Traverse the string to be searched $search and compare
for($j=0;$j<$searchlen;$j++){

If($str[$i+$j]!=$search[$j]){
                 $match=false;
             break;
          }
          $k=$i+$j;
           if($match){
If($j==$searchlen-1){
                                                                                                                                                                                                                                                                   echo "{$str}The {$i}th position starts with {$search}＼n";break;
            }
          }
}
}
?>