PHP escapeshellcmd() Function: Usage and Examples

Escapes shell metacharacters in a command string.

What Is escapeshellcmd() in PHP?

Escapes shell metacharacters in a command string.

Its syntax is:

escapeshellcmd(string $command): string

Parameters:

• $command — Accepted as string; required argument.

Return type: string. This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.

Availability: Escaping varies by platform and configured shell.

Example 1: Basic Usage

<?php

echo escapeshellcmd("echo report; whoami");

Output:

echo report\; whoami

This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.

Example 2: A Different Input

<?php

echo escapeshellcmd("tool --help");

Output:

tool --help

This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.

Practical Example: Applying It in a Program

<?php

$staticCommand = "echo status"; echo escapeshellcmd($staticCommand);

Output:

echo status

This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.

Important Behavior and Edge Cases

• Key behavior: This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.
• Environment: Escaping varies by platform and configured shell.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Escapes shell metacharacters in a command string.
• This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.
• Escaping varies by platform and configured shell.

Summary: This does not protect individual arguments and is not a substitute for escapeshellarg() or command allowlisting. Prefer no shell invocation.