Efficiency Comparison of several php string connections (detailed description), php string

Efficiency Comparison of several php string connections (detailed description), php string

Php has three types of string connections:

1. directly use. For connection.

2. Connect with. =.

3. Press in the array first, and then join through the join function.

The efficiency of the three methods is tested as follows:

The code for the first method is as follows:

<?php      function get_tm() {   list ( $usec, $sec ) = explode ( " ", microtime () );   return (( float ) $usec + ( float ) $sec);   }      $temp="test";   $result="";   define("num",100000);   $start=get_tm();     for($i=0;$i<num;$i++)   {     $result=$result.$temp;   }   echo get_tm()-$start;   ?>

Run four times, except for the first run time, the three times are:

22.165272951126
22.003527164459
22.15947508812

The code for the second method is as follows:

<?php        function get_tm() {   list ( $usec, $sec ) = explode ( " ", microtime () );   return (( float ) $usec + ( float ) $sec);   }      $temp="test";   $result="";   define("num",100000);   $start=get_tm();     for($i=0;$i<num;$i++)   {     $result.=$temp;   }   echo get_tm()-$start;   ?>

Run four times, except for the first run time, the three times are:

3.1967310905457
3.1296961307526
3.0872850418091

The code for the third method is as follows:

<?php         function get_tm() {   list ( $usec, $sec ) = explode ( " ", microtime () );   return (( float ) $usec + ( float ) $sec);   }      $temp="test";   $result="";   $arr=array();   define("num",100000);   $start=get_tm();     for($i=0;$i<num;$i++)   {     array_push($arr, $temp);   }   $result=join($arr);   echo get_tm()-$start;   ?>

Run four times, except for the first run time, the three times are:

3.3184430599213
3.2759411334991
3.2663381099701

As can be seen from the above, it is the most inefficient to directly connect strings through.

The Efficiency Comparison (detailed description) of the above several php string connections is all the content shared by the editor. I hope to give you a reference, and I hope you can also support the help house.