PHP more efficient example of character length judgments

The function to test the length of the string in PHP is strlen, but today I find it more efficient to use isset, saying no, you don't believe me. Let me give you two examples to see. Learn PHP, get a string in PHP has a strlen function, here and you share a in some specific circumstances to judge the length of the string is more efficient way. Take a look at the following two code execution efficiency, you understand the implementation of code to understand the idea, the code is as follows: <?php //Use strlen mode $arr = ' 123456 '; $sTime = microtime (1); if (strlen ($arr) > 6) { //echo 1; } echo microtime (1)- $sTime; //output: 0.00035595893859863 /*-------------------------------------*/  //Use the Isset ($arr {}) mode $arr = ' 123456 '; $sTime = microtime (1); //Open source software: vcphp.com if (!isset ($arr {6})) { //echo "1RN"; } echo microtime (1)- $sTime; Output: 0.00019097328186035 ?>

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PHP more efficient example of character length judgments