PHP 相关效率测试

这是一些PHP相关的效率测试，全部使用PHP7.0的版本进行测试

测试环境

PHP7.0

Xdebug

VLD

useage

phpunit --bootstrap ./lib.php ConcatTest.php

测试结果

字符串拼接方法

PHP7 .time By .= is : 0.0071661710739136 .time By . is : 1.8765479326248 .time By sprintf() is : 2.0971804380417 .time By vsprintf() is : 0.0076944351196289 .time by Join() / Implode() is : 0.0083096981048584

文件get操作

fopen + fclose = 8.23974609375E-6 f get content = 9.8371505737305E-6 fgets = 1.4579296112061E-5

Foreach

Foreach With Reference0.023320913314819 Foreach Without Reference0.0073831081390381 with explode each0.04508900642395 without explode each0.020189046859741

magic

Magic Set Cost :: 3.0422210693359E-7 WithOut Magic Set Cost :: 2.0098686218262E-7 Magic Get Cost :: 2.6059150695801E-7 Without Magic Get Cost :: 2.2578239440918E-7

++$i and $i++ 的OPCODE操作数对比

after

function name: (null) number of ops: 4 compiled vars: !0 = $i line #* E I O op fetch ext return operands ------------------------------------------------------------------------------------- 11 0 E > ASSIGN !0, 9 13 1 POST_INC ~2 !0 2 FREE ~2 3 > RETURN 1

before

function name: (null) number of ops: 3 compiled vars: !0 = $i line #* E I O op fetch ext return operands ------------------------------------------------------------------------------------- 9 0 E > ASSIGN !0, 9 11 1 PRE_INC !0 2 > RETURN 1 branch: # 0; line: 9- 11; sop: 0; eop: 2; out1: -2 path #1: 0,

这边可以看到 ，$i++ 是多了一步 FREE的操作 应该是将临时变量Free掉了

因为$i++是 需要将当前值返回之后再加 因此需要一个临时变量去做返回

++$i是返回增加之后的，过程中无需产生临时变量，也不用去free临时变量，效率较高

for 中的计算是否 会多次计算条件

function name: (null) number of ops: 11 compiled vars: !0 = $arr, !1 = $i line #* E I O op fetch ext return operands ------------------------------------------------------------------------------------- 13 0 E > ASSIGN !0, <array> 15 1 ASSIGN !1, 0 2 > JMP ->5 3 > POST_INC ~4 !1 4 FREE ~4 5 > INIT_FCALL 'count' 6 SEND_VAR !0 7 DO_ICALL $5 8 IS_SMALLER ~6 !1, $5 9 > JMPNZ ~6, ->3 17 10 > > RETURN 1

可以看出 是多次FCALL调用的 并没有优化哈

foreach or array_walk

Foreach Costs :: 0.0025825977325439 ArrayWalk Costs :: 0.0090026617050171

chainCall or non-chainCall

With Chain is :: 0.052052021026611 Without Chain is :: 0.048146963119507