This article mainly introduces the introduction to PHP file programming. It has certain reference value. Now I share it with everyone. Friends in need can refer to it
1 Get file information
1.1 The first way (fopen, fstat, file_exists)
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){ // 检查文件或目录是否存在，存在则返回 TRUE，否则返回 FALSE
$fp = fopen($file_full_path, 'r'); // 打开文件或url，成功时返回文件指针资源，如果打开失败，本函数返回 FALSE。
$fileinfo_arr = fstat($fp); // 通过已打开的文件指针取得文件信息，返回一个数组具有该文件的统计信息
echo '<pre class="brush:php;toolbar:false">';
var_dump($fileinfo_arr);
echo '文件的大小是：' . $fileinfo_arr['size'] . '个字节';
echo '文件的创建时间是：' . date('Y-m-d H:i:s', $fileinfo_arr['ctime']);
echo '文件的访问时间是：' . date('Y-m-d H:i:s', $fileinfo_arr['atime']);
echo '文件的修改时间是：' . date('Y-m-d H:i:s', $fileinfo_arr['mtime']);
}else{
echo '文件不存在';
}Copy after login
1.2 The second way
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){
echo '文件的大小是：' . filesize($file_full_path);
echo '文件的类型是：' . filetype($file_full_path);
echo '文件的创建时间是：' . date('Y-m-d H:i:s', filectime($file_full_path));
echo '文件的访问时间是：' . date('Y-m-d H:i:s', fileatime($file_full_path));
echo '文件的修改时间是：' . date('Y-m-d H:i:s', filemtime($file_full_path));
}else{
echo '文件不存在';
}Copy after login
2 Read the file content
2.1 The first way, fread
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){
// 1、打开文件
$fp = fopen($file_full_path, 'r');
// 2、获取文件的大小
$file_size = filesize($file_full_path);
// 3、读取内容
$con_str = fread($fp, $file_size); // 返回所读取的字符串， 或者在失败时返回 FALSE。
fclose($fp);
// 替换换行符
$con_str = str_replace("\r\n", '<br>', $con_str);
$con_str = str_replace("\n", '<br>', $con_str);
// 替换 tab
$con_str = str_replace(" ", " ", $con_str);
echo $con_str;
}else{
echo '文件不存在';
}Copy after login
2.2 The second way, feof
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){
$fp = fopen($file_full_path, 'r');
// 设置缓冲
$buffer = '';
$buffer_size = 1024;
$con_str = '';
while(!feof($fp)){ // 测试文件指针是否到了文件结束的位置,到达返回true，否则返回false
$buffer = fread($fp, $buffer_size);
$con_str .= $buffer;
}
// 关闭文件
fclose($fp);
$con_str = str_replace("\r\n", '<br>', $con_str);
$con_str = str_replace("\n", '<br>', $con_str);
$con_str = str_replace(" ", ' ', $con_str);
echo $con_str;
}else{
echo '文件不存在';
}Copy after login
2.3 The third way, file_get_contents
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){
$con_str = file_get_contents($file_full_path); // 将整个文件读入一个字符串
$con_str = str_replace("\r\n", '<br>', $con_str);
$con_str = str_replace("\n", '<br>', $con_str);
$con_str = str_replace(" ", ' ', $con_str);
echo $con_str;
}else{
echo '文件不存在';
}Copy after login
3 Create a file and write the content
3.1 Case 1
<?php
$file_full_path = './test.txt';
if(!file_exists($file_full_path)){
if($fp = fopen($file_full_path, 'w')){ // 覆盖写入10句helloworld
$con = '';
for($i=0; $i<10; $i++){
$con .= "HelloWorld\r\n";
}
// 写入文件
fwrite($fp, $con); // fwrite() 返回写入的字符数，出现错误时则返回 FALSE 。
fclose($fp);
}else{
echo '创建文件失败';
}
}else{
echo '文件已经存在';
}Copy after login
3.2 Case 2, file_put_contents
<?php
$file_full_path = './test.txt';
if(!file_exists($file_full_path)){
$con = '';
for($i=0; $i<10; $i++){
$con .= "helloworld\r\n";
}
// 默认是覆盖写，可以追加FILE_APPEND参数，改为追加写。
file_put_contents($file_full_path, $con); // 和依次调用 fopen()，fwrite() 以及 fclose() 功能一样。
}else{
echo '已经存在该文件';
}Copy after login
4 Delete file
<?php
$file_full_path = './test.txt';
if(file_exists($file_full_path)){
if(unlink($file_full_path)){
echo '<br>删除成功';
}else{
echo '<br>删除失败';
}
}else{
echo '文件不存在，无法删除';
}Copy after login
5 Modify file name
<?php
$file_full_path = './test.txt';
$file_new_full_path = './王八.txt';
$file_new_full_path = iconv('utf-8', 'gbk', $file_new_full_path);
if(file_exists($file_full_path)){
if(rename($file_full_path, $file_new_full_path)){ // 重命名一个文件或目录
echo '改名成功！';
}else{
echo '改名失败！';
}
}else{
echo '文件不存在';
}Copy after login
6 Operate file directory
6.1 Create a first-level directory
<?php
$dir_full_path = './abc';
// 判断有没有该目录
if(!is_dir($dir_full_path)){
if(mkdir($dir_full_path)){
echo '创建目录成功！';
}else{
echo '创建目录失败！';
}
}else{
echo '已经存在该目录，无法再次创建';
}Copy after login
6.2 Create a multi-level directory
<?php
$dir_full_path = './abc/edf/xyz';
if(!is_dir($dir_full_path)){
if(mkdir($dir_full_path, 0777, true)){ // true 表示递归创建
echo '创建目录成功';
}else{
echo '创建目录失败';
}
}else{
echo '已经存在该目录，无法再次创建！';
}Copy after login
6.3 Delete a directory (first level)
<?php
$dir_full_path = './abc';
if(is_dir($dir_full_path)){
if(rmdir($dir_full_path)){
echo '删除目录成功';
}else{
echo '删除目录失败';
}
}else{
echo '不存在该文件夹';
}Copy after login
7 Application cases of file programming
7.1 How to copy a picture
<?php
$file_src_full_path = 'F:/壁纸.jpg';
$file_src_full_path = iconv('utf-8', 'gbk', $file_src_full_path);
$file_des_full_path = 'D:/amp/WWW/萧山.jpg';
$file_des_full_path = iconv('utf-8', 'gbk', $file_des_full_path);
if(file_exists($file_src_full_path)){
if(copy($file_src_full_path, $file_des_full_path)){
echo '拷贝成功';
}else{
echo '拷贝失败';
}
}else{
echo '没有这个文件';
}Copy after login
7.2 Traverse a folder and determine whether the contents under the folder are directories and files
<?php
$dir_full_path = 'D:/amp/WWW/';
if(is_dir($dir_full_path)){
$dir_handle = opendir($dir_full_path); // 如果成功则返回目录句柄的 resource，失败则返回 FALSE
while(($file_name = readdir($dir_handle)) !== false){ // 成功则返回文件名 或者在失败时返回 FALSE
if(is_dir($dir_full_path . $file_name)){
echo $file_name . '是目录<br>';
}else{
echo $file_name . '是文件<br>';
}
}
closedir($dir_handle);
}else{
echo '不是目录，无法打开';
}Copy after login
7.3 Write a function to count the size of all files in a directory
<?php
$dir_name = 'D:/amp/WWW';
function getDirSize($dir_name){
$dir_size = 0;
$dir_handle = opendir($dir_name);
while(($file_name = readdir($dir_handle)) !== false){
$file = $dir_name . '/' . $file_name; // 文件全名
if($file_name!=='.' && $file_name!=='..'){
if(is_dir($file)){
$dir_size += getDirSize($file);
}else{
$dir_size += filesize($file);
}
}
}
closedir($dir_handle);
return $dir_size;
}
echo getDirSize($dir_name);Copy after login
7.4 Delete a directory
<?php
$dir_name = 'D:/amp/WWW/.idea';
function rrmdir($src){
$dir_handle = opendir($src);
while(false !== ($file = readdir($dir_handle))){
if(($file != '.') && ($file != '..')){
$full = $src . '/' . $file;
if(is_dir($full)){
rrmdir($full);
}else{
unlink($full);
}
}
}
closedir($dir_handle);
rmdir($src);
}
rrmdir($dir_name);Copy after login
The above is the entire content of this article. I hope it will be helpful to everyone’s study. For more related content, please pay attention to the PHP Chinese website!
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The above is the detailed content of Introduction to PHP file programming. For more information, please follow other related articles on the PHP Chinese website!
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