Examples of PHP's more efficient character length judgment

Learn about PHP. Getting strings in PHP has a strlen built-in function;

Here we will share with you a more efficient way to judge the length of a string under certain circumstances;

Let's take a look at the execution efficiency of the following two sections of code and understand the code execution ideas:

The code is as follows:	Copy code
<? Php // Use strlen $ Arr = '000000 '; $ STime = microtime (1 ); If (strlen ($ arr)> 6 ){ // Echo 1;   }      Echo microtime (1)-$ sTime; // Output: 0.00035595893859863 /*-------------------------------------*/ // Use isset ($ arr {}) $ Arr = '000000 '; $ STime = microtime (1 ); If (! Isset ($ arr {6 })){ // Echo "1rn ";    }  Echo microtime (1)-$ sTime; // Output: 0.00019097328186035