PHP操作文件函数比较

 

• file_get_contents
• fpassthru
• fgets
• file
• require
• readfile

 

 

 

 

 

 

 

PHP

 

1	string file_get_contents ( string $filename [ , bool $use_include_path = false [ , resource $context [ , int $offset = - 1 [ , int $maxlen ] ] ] ] )

 

file_get_contents() is the preferred way to read the contents of a file into a string. It will use memory mapping techniques if supported by your OS to enhance performance.

下面将老外用1MB文件来进行测试的结果也贴一下,有兴趣的朋友补充测试.

 

Function	Sample Usage	Time (s)	Memory (b)
file_get_contents	PHP   1 echo file_get_contents ( $filename ) ;	0.00564	1067856
fpassthru	PHP   1 fpassthru ( $fp ) ;	0.00184	20032
fgets	PHP   1 2 3 4 5 $fp = fopen ( $filename , "rb" ) ; while ( ! feof ( $fp ) ) {      echo fgets ( $fp ) ; }	0.07190	30768
file	PHP   1 echo join ( "" , file ( $filename ) ) ;	0.06464	2185624
require_once	PHP   1 require_once ( $filename ) ;	0.08065	2067696
include	PHP   1 include ( $filename ) ;	0.08202	2067696
readfile	PHP   1 readfile ( $filename ) ;	0.00191	19208

 

接着是32KB的小文件处理上

 

Function	Time (s)		Memory (b)
	32Kb File	1Mb File	32Kb File	1Mb File
file_get_contents	0.00152	0.00564	52480	1067856
fpassthru	0.00117	0.00184	20016	20032
fgets	0.00195	0.07190	30760	30768
file	0.00157	0.06464	87344	2185624
require_once	0.00225	0.08065	67992	2067696
include	0.00222	0.08202	67928	2067624
readfile	0.00117	0.00191	19192	19208

用上面的结果的话,readfile 和fpassthru 是我们最佳的选择.