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This article will introduce to you how to specify the access and modification time of files in PHP. Then we can use PHP's built-in function touch()
to achieve the settings.
The touch()
function in PHP is a built-in function used to set the access and modification time of a specified file.
The file name of the file whose access and modification time must be set is sent as a parameter to the touch()
function together with the time. True is returned on success and False on failure. If the file does not exist, it is created first. (Recommended: PHP Tutorial)
Syntax:
touch(filename, time, atime)
Parameters:
in PHP touch()
The function accepts three parameters.
filename
: This is a required parameter that specifies the filename of the file whose access and modification times must be changed.
#time
: This is an optional parameter used to specify the time. By default, it takes the current system time.
atime
: It is an optional parameter used to specify the access time. By default, if no parameter is set, the current system time is required.
Return value:
Returns True on success and False on failure.
Note:
Time resolution may vary from file system to file system, so unexpected results may sometimes occur.
The $time parameter in the touch() function has a future limit of approximately 1,000,000 seconds.
The following code example illustrates the touch()
function.
Suppose there is a file named "gfg.txt"
Example 1:
<?php $file_pointer = "gfg.txt"; // 使用touch()函数将文件的修改时间更改为当前系统时间 if (touch($file_pointer)) { echo ("$file_pointer 修改时间已设置为当前系统时间。"); } else { echo ("$file_pointer 修改时间无法更改"); }
Output :
gfg.txt 修改时间已设置为当前系统时间。
Example 2:
<?php $file_pointer = "gfg.txt"; $time = time() - 18000; // 使用touch()函数将文件的修改时间更改为当前系统时间 if (touch($file_pointer, $time)) { echo ("$file_pointer 修改时间已经改为过去5小时。"); } else { echo ("$file_pointer 修改时间无法更改"); }
Output:
gfg.txt修改时间已经改为过去5小时。
This article is about accessing and specifying files in PHP The method of modifying the time is introduced. I hope it will be helpful to friends who need it!
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