php-prereqcheck

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Helper class to create Prerequisite Checks. It allows you to easily create a Prerequisite Check Script for your project, e.g. matching (php) version, installed extensions, settings etc. It also allows you to write your own checks to implement individual checks.

Features

• Simple to use API to create own prerequisite scripts / checks
• Console, Web or silent (programmatic) output
• Builtin-checks:
  • php version check
  • php ini settings check
  • php extension checks
  • PDO DB connection check
  • dir writable check
• Extensible: Write your own Check classes easily

Planned features

• Output renderers to customize output
• more built-in checks like http service availability, internet access, …

Sample usage

# Include class and instantiate a PrereqChecker:
require_once('PrereqChecker.php');
$pc = new PrereqChecker();

# Check PHP version:
$pc->checkMandatory('php_version','>=','5.3.0');

# Check for installed PHP extensions:
$pc->checkMandatory('php_extension','gd');
$pc->checkMandatory('php_extension','mbstring');
$pc->checkMandatory('php_extension','pdo');

# Check for php.ini settings:
$pc->checkOptional('php_ini','display_errors','off','boolean');
$pc->checkOptional('php_ini','memory_limit','>=256MB','number');
$pc->checkOptional('php_ini','error_reporting',E_STRICT,'bit_enabled');
# check a php.ini string using a regular expression:
$pc->checkOptional('php_ini','date.timezone','/Europe\/.+/','string');

# Check if dir exists and is writable:
$pc->checkMandatory('dir_writable','/tmp/');

# Check if a PDO DB Connection could be established:
$pc->checkOptional('db_pdo_connection',array('dsn'=>'mysql:host=127.0.0.1','username'=>'test','password'=>'test'));

# Create own checks:
class FileExistsChecker extends PrereqCheck {
    public function check($filename = null) {
        $this->name = "File exists: {$filename}";
        if (file_exists($filename)) {
            $this->setSucceed();
        } else {
            $this->setFailed('File does not exists.');
        }
    }
}
$pc->registerCheck('file_exists','FileExistsChecker');
$pc->checkMandatory('file_exists','some_file.txt');

# Each check returns a CheckResult instance:
$res = $pc->checkMandatory('php_version','>=','5.3.0');
if ($res->success()) {
    echo "Yes, your PHP version is compliant.";
}


# did all the checks succeed?
if ($pc->didAllSucceed()) {
    echo "All tests succeeded!\n";
} else {
    echo "Some tests failed. Please check.\n";
}