Backend Development
PHP Tutorial
How to use php str_replace function parameter when it is an array
How to use php str_replace function parameter when it is an array
Introduction: This article introduces the system functions related to file operations in PHP. These functions are also very important. Below, Tianya still gives detailed examples of the more commonly used ones.
basename — Returns the file name part of the path
dirname — Returns the directory part of the path
string basename ( string $path [, string $suffix ] )
string dirname ( string $path )
Example, the code is as follows:
// PHP Blog http://www.php.cn
$path = "/home/httpd/www.phpcn/index.php";
echo basename($path);
echo basename($path, '. php');
echo basename($path, '.xxx');
echo dirname($path);
?>
//Result:
index.php
index
index. php
/home/httpd/www.phpfensi.com
Note: If the file name ends with the correct suffix, then this part will also be removed.
chgrp — change the group to which the file belongs
chown — change The owner of the file
chmod — change the file mode
bool chmod ( string $filename , int $mode )
Example, the code is as follows: chmod('/home/phpha.txt', 0755);
copy, copy file, the code is as follows:
if(copy('index.php', 'index.php.bak')){
echo 'copy success';
}
index.php survives in the current directory. bak file.
delete — see unlink or unset
unlink — delete the file
The code is as follows:
if(unlink('index.php.bak')){
echo 'unlink success ';
}
?>
deleted index.php.bak
disk_free_space — Returns the free space in the directory
disk_total_space — Returns the total disk size of a directory
diskfreespace — Alias for disk_free_space
Code As follows:
//Under Windows:
echo disk_free_space("C:"), '
';
echo disk_total_space("C:");
? >
//Result: The number of bytes returned
17433419776
32218386432
fopen — Open a file or URL
fgets — Read a line from the file pointer
feof — Test whether the file pointer reaches end of file The location of
fread — read a file (safe for binary files)
fwrite — write a file (safe for binary files)
fclose — close an open file pointer
The code is as follows:
$fp = fopen('hello.txt', 'r'); //Open a file
$n = 1;
while(!feof($fp)){
echo $ n, ' - ', fgets($fp), '
'; //Read a line and output
$n++;
}
fclose($fp); //Close the file
?> Read in a line and parse CSV fields
fgetss — Read a line from the file pointer and filter out HTML tags
fputcsv — Format the line into CSV and write to the file pointer
fputs — Alias for fwrite
The code is as follows:
$fp = fopen('hello.txt', 'r');
while(false !== ($char = fgetc($fp))){
echo $char, '-';
}
? & Gt;
// Output:
W-E-L-C-O-M-E-E-O-M-Y-O-O-G-: -H-T-P-P-B-L-O-O-H-P-H-A-A-. -c-o-m-
file_exists — Check whether the file or directory exists, the code is as follows:
if(file_exists('hello.txt')){
echo 'hello.txt exists';
} Else { c el & gt; // Output: hello.txt exist File_get_Contents — reads the entire file File_put_Contents — Write a string to a file file — Read the entire file into an array The code is as follows: if($content = file_get_contents('hello.txt')){ file_put_contents('hello.txt.bak', $content); } ?> //Equivalent to copying a copy of hello.txt if($content = file( 'hello.txt')){ print_r($content); } ?> //Array form, each line is an array member Array ( [0] => ; Welcome to my blog: [1] => http://www.phpfensi.com ) fileatime — Get the last access time of the file filectime — Get the inode modification time of the file filegroup — Get the group of the file fileinode — Get the inode of the file filemtime — Get the file modification time fileowner — Get the owner of the file fileperms — Get the permissions of the file filesize — Get the file size filetype — Get The file typecode is as follows: echo fileatime('hello.txt'); echo filectime('hello.txt'); echo filegroup('hello.txt');echo filemtime('hello.txt'); echo fileowner('hello.txt'); echo substr(sprintf('%o', fileperms('hello.txt')), -4);
echo filesize('hello.txt'); echo filetype('hello.txt'); ?> //Output: 1353329003 1353329003 0 1353330002 0
file
fscanf — Format input from a file fseek — Locate the file pointer fstat — Get file information through the open file pointer ftell — Return the read/write position of the file pointer ftruncate — Truncate the file to The given length glob — Finds the file path matching the pattern is_dir — Determines whether the given file name is a directory is_executable — Determines whether the given file name is executable is_file — Determines whether the given file name is For a normal file is_link — Determine whether the given file name is a symbolic link is_readable — Determine whether the given file name is readable is_uploaded_file — Determine whether the file was uploaded through HTTP POST is_writable — Determine whether Whether the specified file name is writableis_writeable — Alias of is_writableExplanation: The above functions are used to determine whether the file or directory meets the corresponding conditions and return TRUE or FALSE.lchgrp — Changes group ownership of symlink lchown — Changes user ownership of symlink link — Establish a hard link linkinfo — Get information about a connection lstat — Give information about a file or symbolic link mkdir — Create a new directory move_uploaded_file — Move the uploaded Move the file to a new location parse_ini_file — Parse a configuration file pathinfo — Return file path information pclose — Close the process file pointer popen — Open the process file pointer readfile — Output a file readlink — Return The target of the symbolic link realpath — Returns the normalized absolute path name rename — Renames a file or directory rewind — Rewinds the position of the file pointer rmdir — Delete a directoryset_file_buffer — alias for stream_set_write_buffer
stat — gives information about a file
symlink — creates a symbolic link
tempnam — creates a file with a unique file name
tmpfile — creates a temporary file
touch — sets the file’s Access and modification time
umask — change the current umask
clearstatcache — clear the file status cache
Summary: In fact, there are so many file operation functions, most of which are not used. At the same time, you can see that these functions are similar to linux commands. How big.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1666
14
1425
52
1325
25
1272
29
1252
24
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
