Use In_array () foreach Array_search () in PHP to find performance comparisons when arrays are included, Phpforeach two-dimensional arrays _php tutorial

PHP uses In_array () foreach Array_search () to find out if an array contains performance comparisons, Phpforeach two-dimensional arrays

To determine whether a character is contained in an array or not, there are many ways that beginners who have just learned PHP tend to use loops to solve the problem, and for a small web site, this solution is not going to be a big deal. But in terms of performance, this method is not the best method, the following author of Foreach,in_array () Array_search These three methods to compare the performance of these three methods of differences.

<?php$runtime= new Runtime; $runtime->start ();    $a = ' k ';    $b = Array (' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ');/*for ($i =0; $i < 100000; $i + +) {    var_dump (In_array ($a, $b));    } *//*for ($i =0; $i < 100000; $i + +) {    foreach ($b as $key + $value) {        if ($a = = $value) {            //echo True;
  continue;}}}    *//*for ($i =0; $i < 100000; $i + +) {    array_search ($a, $b);} */$runtime->stop (); Echo $_b;echo "Execution time:" $runtime->spent (). "Milliseconds"; class runtime{  var $StartTime = 0;  var $StopTime = 0;  function Get_microtime () {    list ($usec, $sec) = explode (' ', Microtime ());    return (float) $usec + (float) $sec);  }  function Start () {    $this->starttime = $this->get_microtime ();  }  function Stop () {    $this->stoptime = $this->get_microtime ();  }  function spent () {    return round (($this->stoptime-$this->starttime) * (1);  }}? >

The above program execution time is as follows:

In_array ()

Foreach

Array_search ()

It can be seen from the above that the performance of these three methods, Array_search and In_array performance is similar, foreach performance is the worst.

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