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How to copy, delete, rename files and create a temporary file in PHP?
How to copy, delete, rename files and create a temporary file in PHP?
In the previous article, I brought you "Teach you how to write a file in PHP in three minutes", which introduced in detail how we write a file in PHP. This article Continue to bring you some knowledge about the PHP file system, such as creating a temporary file, how to copy and delete a file. Hope it helps everyone!
How to create a temporary file?
In our last article, the files we wrote and created are permanent. In our daily development and use, it is also necessary to create a temporary file, and very useful.
Create a temporary file that can be deleted after we are finished using it. We do not need to maintain the deletion status of this file.
Then we need to use the resource tmpfile ( ) function, the example is as follows:
<?php //创建了一个临时文件 $a = tmpfile(); //向里面写入了数据 $b = fwrite($a, '好好学习天天学习'); //关闭临时文件，文件即被删除 fclose($a); echo '向临时文件中写入了'.$b . '个字节'; ?>
Output result:
As can be seen from the above example, a temporary file is created through the resource tmpfile () function and the resource type is returned. The file is deleted when it is closed.
How to rename a file?
When we deal with files daily, we not only need to create them, but sometimes we also need to rename the files that have been created. Then let’s take a look at what should be done. Go and rename the file.
At this time we will use rename. The syntax format is as follows:
bool rename($旧名,$新名);
The example is as follows:
First, I created a file named test.txt
Next, enter:
<?php //旧文件名 $a = 'test.txt'; //新文件名 $b = 'newtest.txt'; //复制文件 rename($a, $b); ?>
After outputting the results, the file originally named test.txt is now:
From the above example, Files can be renamed through rename.
How to copy files?
# Copying files is also a common operation in our daily life, so how should we implement it?
bool copy(源文件,目标文件)
The example is as follows:
Same as the above example, I first created a test.txt file
<?php //旧文件名 $a = 'test.txt'; //新文件名 $b = 'test_new.txt'; //修改名字。 copy($a, $b); ?>
By copying, the output result is:
From the above results, we know that files can be copied through copy().
How to delete files?
#Deleting a file means deleting a file in the specified path, but this deletion is direct deletion. If you are using a Windows computer, you cannot see this file in the Recycle Bin. You will find that the file simply disappears.
bool unlink(指定路径的文件)
The example is as follows:
<?php
$a = 'test.txt';
if (unlink($a)) {
echo "删除文件成功 $filename!\n";
} else {
echo "删除 $a 失败!\n";
}
?>Output result:
As can be seen from the above example, files can be deleted through unlink.
Recommended learning: "PHP Video Tutorial"
The above is the detailed content of How to copy, delete, rename files and create a temporary file in PHP?. For more information, please follow other related articles on the PHP Chinese website!
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