Use in_array () foreacharray_search () in php to find whether the array contains Performance Comparison. phpforeach two-dimensional array _ PHP Tutorial

In php, use in_array () foreacharray_search () to check whether the array contains the Performance Comparison. phpforeach two-dimensional array. Php uses in_array () foreacharray_search () to check whether an array contains the same performance. phpforeach uses a two-dimensional array to determine whether a character is included in an array, I just used in_array () foreach array_search () in php to find whether the array contains performance comparison, phpforeach two-dimensional array

There are many methods to determine whether a character is included in an array. new users who are just learning php tend to use loops. for small websites, this solution will not cause any major problems. However, in terms of performance, this method is not the best method. I will compare the performance differences between the three methods, foreach and in_array () array_search.

<? 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-> sp Ent (). "millisecond"; 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) * 1000, 1) ;}}?>

The execution time of the above programs is shown in:

In_array ()

Foreach

Array_search ()

From the above, we can roughly see the performance of these three methods. array_search and in_array are similar, and foreach is the worst.

Comparison () foreach array_search () compares the performance of array inclusion. phpforeach two-dimensional array determines whether a character is included in an array. There are many methods, just...