Analysis of the efficiency difference and application of switch and IfElse in PHP, switchifelse_php tutorial

The efficiency Difference and application analysis of switch and IfElse in PHP, Switchifelse

In this paper, the efficiency difference and application of switch and IfElse in PHP are analyzed. Share to everyone for your reference. The specific analysis is as follows:

Both methods in PHP are used to determine whether a value satisfies a condition, and if it satisfies/is not satisfied to make a different action.

Regardless of the language of the program, will certainly take into account the operational efficiency of the Code. After reviewing some of the information, switch and ifelse in different ' environment ' efficiency each has the superiority.

1, when the value to be judged is a constant (fixed value), the operation efficiency of switch is higher than that of IfElse.

$changliang =3;   The value of variable judgment is constant switch ($changliang) {case  1:    echo ' constant value is 1 ';    break;   Jump out  of the Loop Case 2:    echo ' constant value is 2 ';    break;  Case 3:    echo ' constant value is 3 ';    break;}

2, when judged value as a variable, ifelse operating efficiency is higher than switch,ifelse implementation of the policy, will start judging from the first condition, until the last else, so learn to use switch has the advantage;

$a = $_get[' a ']; Pass value after get pass value; The value of the evaluated if ($a =1) {  echo ' variable A is 1 ';} ElseIf ($a =2) {  echo ' variable A has a value of 2 ';} ElseIf ($a =3) {  echo ' variable A has a value of 3 ';} else{  Echo ' variable A's value is not known ';}

I hope this article is helpful to everyone's PHP programming.

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