Comparison of if and or in PHP _ php skills

This article mainly introduces the comparison of if and or running efficiency in PHP, which helps to gain a deeper understanding of the efficiency comparison of similar statements in PHP programs and provides some reference value for compiling high-quality PHP programs, for more information, see the example in this article to describe the comparison of if and or running efficiency in PHP. Share it with you for your reference. The specific implementation method is as follows:

An example is provided to illustrate the running efficiency of if and or. if you are interested, you can test it. here, the test result is that or is more efficient than if. the specific code is as follows:

The code is as follows:

<? Php
$ T1 = microtime ();
While ($ I <= 10000 ){
If (! Defined ('app _ path'); // 0.011059
// Defined ('app _ path') OR 1; // 0.009398
$ I ++;
}

$ T2 = microtime ();
Echo $ t2-$ t1;
?>

Instance 2:

The code is as follows:

<? Php
$ T1 = microtime ();

While ($ I <= 1000000 ){
If (! Defined ('app _ path'); // 0.20043
// Defined ('app _ path') OR 1; // 0.107475
$ I ++;
}

$ T2 = microtime ();
Echo $ t2-$ t1;
?>

I hope this article will help you with PHP programming.