How can file permissions impact the functionality of PHP file handling functions like fopen and fread?

File permissions can impact the functionality of PHP file handling functions like fopen and fread by restricting the ability to read or write to certain files. If the file being accessed does not have the appropriate permissions set, PHP will not be able to open or read from the file, resulting in errors or unexpected behavior. To solve this issue, you can ensure that the file being accessed has the correct permissions set to allow PHP to read from it. 

$file = 'example.txt';

// Check if file has read permissions
if (is_readable($file)) {
    $handle = fopen($file, 'r');
    
    if ($handle) {
        $content = fread($handle, filesize($file));
        
        fclose($handle);
        
        echo $content;
    } else {
        echo 'Error opening file.';
    }
} else {
    echo 'File does not have read permissions.';
}

Keywords

file permissions PHP fopen fread functionality

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