PHP's method for judging the beginning and end of a string _php tips

This article illustrates the way PHP judges the beginning and end of a string. Share to everyone for your reference, specific as follows:

Variable:
$s 1 = "Dotcoo world!";
$s 2 = "dotcoo";
$s 3 = "Hello Dotcoo";
PHP judgment string Start:
var_dump (substr ($s 1, 0, strlen ($s 2)) = = = $s 2);
Var_dump (Strpos ($s 1, $s 2) = 0);
Var_dump (strncmp ($s 1, $s 2, strlen ($s 2)) = = 0);
Var_dump (Substr_compare ($s 1, $s 2, 0, strlen ($s 2)) = = 0);
End of PHP judgment string:
var_dump (substr ($s 1, 0, strlen ($s 2)) = = = $s 2);
Var_dump (Substr_compare ($s 3, $s 2,-strlen ($s 2)) = = 0);

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I hope this article will help you with the PHP program design.