chdir function to change current directory to a new dir in PHP

Use chdir() only when changing the process working directory is necessary

For most file operations, absolute paths based on __DIR__ are easier to reason about. If a script really needs to change the current working directory, validate the target first and restore the previous directory when the temporary work is complete.

<?php
$target = __DIR__ . '/test_dir';
$previous = getcwd();

if (!is_dir($target)) {
    throw new RuntimeException('Target directory does not exist.');
}

if ($previous === false || !chdir($target)) {
    throw new RuntimeException('Unable to change directory.');
}

try {
    echo htmlspecialchars((string) getcwd(), ENT_QUOTES, 'UTF-8');
} finally {
    chdir($previous);
}
?>

Avoid suppressing errors with @chdir(). Test the path and handle a failed return value explicitly.

echo getcwd();
chdir('test_dir');
echo "<br>";
echo getcwd();

Output of above code is here

J:\php_files\t\dir
J:\php_files\t\dir\test_dir

chdir() to change the directory to a different one. This function returns true on success and false on Failure. We have used getcwd() function to get the current directory location.

To change from current directory to one step up directory

echo getcwd();
chdir('..');
echo "<br>";
echo getcwd();

As chdir() returns TRUE or FALSE we can use if condition to post message.

echo getcwd();
echo "<br>";
if(chdir('test_dir2')){
echo getcwd();
}else{
echo " Wrong Directory ";
}

Example 1: Changing to Parent Directory

<?php
echo getcwd();
chdir('..');
echo "<br> New Directory: " . getcwd();
?>

Example 2: Handling Non-Existent Directory

<?php
if (!chdir('invalid_dir')) {
    echo "Directory does not exist.";
}
?>

Directory Functions getcwd() : Get current directory scandir(): List files and directories

Subhendu Mohapatra

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chdir() : Change directory

Use chdir() only when changing the process working directory is necessary

Example 1: Changing to Parent Directory

Example 2: Handling Non-Existent Directory

Subhendu Mohapatra