PHP determines whether a string exists PHP string detection code

php determines whether the string is stored

Solution: Use === or !==

Full code:

if(stripos($sql, "insert") === 0){
 $excuteResult = mysql_query($sql);
 if($excuteResult){
 $sql = $ sql2."where id = (select max(id) from subway2)";
 }
 } else if(stripos($sql, "delete") === 0 || stripos($sql, "update") == = 0){

if (strpos($foo, “my”)===0) { echo('I find!');}