php cli shell script cheatsheet

Shebang

#!/usr/bin/php
<?php

Change working directory to script directory

$workDir = realpath(dirname(__FILE__));
chdir($workDir);

Arguments

$_SERVER['argv'][0] // = scriptname (myscript.php)

$_SERVER['argv'][1] // = first cmd argument "foo" (myscript.php foo)

Get Environment Variable

$certbotDomain = getenv('CERTBOT_DOMAIN');

Write to stderr

fwrite(STDERR, “hello, world\n”);

Exit code

exit(1);

Execute a shell command and return the output

$output = shell_exec('uname -r');

Disable xdebug html output

ini_set('html_errors', false);

Color output

Colors: https://misc.flogisoft.com/bash/tip_colors_and_formatting

echo "\033[31mERROR: $message \033[33mLine $lineNumber \033[39m$line\n";

Background color:

echo "\033[31;43mRed on yellow background\n";

Reset colors to defaults:

echo "\033[0m";

Direct inline execution

php -r '$parts = explode(".", phpversion()); echo $parts[0] . "." . $parts[1];'