What are the implications of setting files to executable permissions (0755, 0775, 0777) in PHP scripts and how can this be avoided for non-executable files?

Setting files to executable permissions (0755, 0775, 0777) in PHP scripts can pose a security risk as it allows the files to be executed as programs, potentially leading to unauthorized code execution. To avoid this, you can ensure that PHP scripts are not given executable permissions by setting the appropriate permissions (e.g., 0644) for non-executable files. 

// Set file permissions to 0644 for non-executable files
$file = 'example.php';
if (is_file($file)) {
    chmod($file, 0644);
    echo "File permissions set to 0644 for $file";
} else {
    echo "File does not exist";
}

Keywords

file permissions chmod security vulnerability non-executable files umask

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