String length judgment in php program

This article mainly introduces the judgment of string length in PHP program. Interested friends can refer to it. I hope it will be helpful to everyone.

Method one:

$str = ‘aaaaaa';
if(strlen($str) > 6){
 echo "字符串大于6";
}

Method two:

if(isset($str{6}){
}

The second method is more efficient.

In PHP, all variables are saved using a structure -zval. Although strlen directly obtains the len, there is still a function call, and isset is a syntax structure of PHP, so it is more quick! So the second method can be used when determining whether a string is greater than or less than a number of characters.

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