去年就曾经测试过php filesystem相关函数和include require的性能，今天无意间看到国外一个更全面的对比，显然include和require是最慢的。所以尽量少用include，尤其是作为缓存，最好还是用文本缓存，我原以为直接缓存为php脚本速度比较快，后来测试才发现include效率很低。 出处：http://www./wiki/Readfile_vs_include
| Function | Brief Description |
|---|---|
| string file_get_contents ( string filename [, int use_include_path]) | Reads entire file into a string |
| int fpassthru ( resource handle) | Output all remaining data on a file pointer |
| string fgets ( resource handle [, int length]) | Gets line from file pointer |
| array file ( string filename [, int use_include_path]) | Reads entire file into an array |
require(string filename)
include(string filename)
require_once(string filename)
include_once(string filename)
|
includes and evaluates the specific file. |
| int readfile ( string filename [, int use_include_path]) | Outputs a file |
| Function | Sample Usage | Time (s) | Memory (b) |
|---|---|---|---|
| file_get_contents | echo file_get_contents($filename); | 0.00564 | 1067856 |
| fpassthru | fpassthru($fp); | 0.00184 | 20032 |
| fgets |
$fp = fopen($filename,"rb");
while(!feof($fp))
{
echo fgets($fp);
}
|
0.07190 | 30768 |
| file | echo join("",file($filename)); | 0.06464 | 2185624 |
| require_once | require_once($filename); | 0.08065 | 2067696 |
| include | include($filename); | 0.08202 | 2067696 |
| readfile | readfile($filename); | 0.00191 | 19208 |
| 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 |
