Using PHP's is_executable() Function to Check File Executability

In PHP, the is_executable() function checks whether a given file is executable.

Function Definition

bool is_executable ( string $filename )

Parameters

$filename

: the path of the file to be checked.

Return Value

Returns true if the file is executable; otherwise returns false.

Code Example

<?php
$file = '/path/to/file.php';

if (is_executable($file)) {
    echo "文件可执行
";
} else {
    echo "文件不可执行
";
}
?>

The example checks /path/to/file.php and outputs whether it is executable.

Explanation

Define a file path variable $file.

Use is_executable() to test executability; the result is a boolean.

Use an if‑else statement to output the appropriate message.

Notes

The function only checks the execute permission of a file; it returns false if the file does not exist or is inaccessible. is_executable() works on files, not directories.

Typical Use Cases

Verify that uploaded files are not executable to improve web‑application security.

Determine whether a file is an executable program for system‑administration tasks.

Check a user’s execute permission on a specific file.

Conclusion

The is_executable() function is a useful tool for enhancing system security by allowing developers to programmatically verify file executability and act accordingly.