Detailed graphic and text explanation of file operation in PHP

This article mainly introduces PHP file operations, including file reading, determining whether the file exists, modification time, etc. It has certain reference value. Interested friends can refer to the examples of this article

The specific code for PHP file operation is shared with everyone for your reference. The specific content is as follows

(1) File reading

file_get_contents( )

Example:

Copy after login

(2) File operation

fopen: open
fread: read
fwrite: Write
fclose: Close

Instance:

';

// 返回 int(0),说明没有成功写入
// 原因：在于第二个mode参数，选的r，即只读打开
var_dump(fwrite($fh, '测试一下，能不能用'));

// 关闭资源
fclose($fh);


/*
r+读写模式，并把指针指向文件头
写入成功
注：从文件头，写入时，覆盖相等字节的字符
*/
$fh = fopen($file, 'r+');
echo fwrite($fh, 'hello') ? 'success': 'fail','
';
fclose($fh);


/*
w:写入模式(fread读不了)
并把文件大小截为0
指针停于开头处
*/
echo '
';
$fh = fopen('./test.txt', 'w');
fclose($fh);
echo "ok!";

(3) Whether the file exists and is modified Time

filemtime

";
 echo '上次修改时间是：',date('Y-m-d,H:i:s',filemtime($file));
}else{
 echo "不存在";
}

Demo address: Demo6-file operation

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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