About strpos in PHP

Strpos is used to find one or more strings in one string code: $ str1 & amp; #39; ext-gen1226 & amp; #39 ;$ str2 & amp; #39; ext & amp; #39; // echostrpos ($ str1, str2, 0); if (strpos ($ str1, str2, 0) false) {echo & amp strpos is used to find one or more strings in one string.
Code:
$ Str1 = 'ext-gen1226 ';
$ Str2 = 'ext ';
// Echo strpos ($ str1, str2, 0 );
If (strpos ($ str1, str2, 0) = false ){

Echo 'AAA ';
} Else {
Echo 'BBB ';
}
Result: AAA
Normally, the output is BBB. this is because str2 is at the first position of str1. The result is that strpos returns 0. the default value is false. We use the double equal sign to judge, therefore, AAA is returned;
$ A = $ B is equal to TRUE if $ a is equal to $ B.
$ A ===$ B all equal to TRUE, if $ a is equal to $ B, and their types are the same. (PHP 4 is introduced, so it can be determined by changing it to three equal signs.