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How to determine whether a string exists in php

WBOYOriginal: 2016-07-25 09:12:213048browse

Example, use === or !== to determine whether a string exists.

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!');}

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How to determine whether a string exists in php

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