How to Use PHP’s is_executable() to Check File Executability

Function Definition

bool is_executable(string $filename)

Parameter

$filename: path of the file to be checked.

Return Value

Returns true if the file is executable, otherwise false.

Example Code

<?php
$file = '/path/to/file.php';
if (is_executable($file)) {
    echo "文件可执行
";
} else {
    echo "文件不可执行
";
}
?>

Explanation

Define $file with the target path.

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

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

Important Notes

The function only checks the execute permission of the specified file; if the file does not exist or is inaccessible, it returns false.

is_executable() works on files only, not on directories.

Typical Use Cases

Validate uploaded files to ensure they are not executable, improving web‑application security.

Determine whether a given file is an executable binary before performing system operations.

Check file permissions to decide if a particular user can execute the file.

Conclusion

The PHP is_executable() function provides a simple way to verify a file’s execute permission, helping developers enhance security and make informed decisions based on the check result.