String search for special character comma

As shown below:

Why is the result no? ? ? ?
Please let me know

Reply content:

As shown below:

Why is the result no? ? ? ?
Please let me know

strrpos returns the character position. If the character is at the beginning, it returns 0. If the character is not found, it returns flase

Correct code:

if(strrpos($str,',405,') !== false){
    echo "ok";
}
else{
    echo "no";
}

http://php.net/manual/zh/function.strrpos.php