PHP操作文件函数比较(转)

 

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

 

 

 

 

 

 

 

PHP

 

1	stringfile_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	echofile_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($fp)) {     echofgets($fp); }

0.07190

30768

file

 

 

 

 

 

PHP

 

1	echojoin("",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.