TYPO3 Fluid ViewHelper - StringContains

gistfile1.txt

<?php
name SOME\NAMESPACE;

class StringContainsViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

	/**
	 * Returns true depending on $needle in $haystack and which mode is chosen
	 * @param string $haystack
	 * @param string $needle
	 * @param string $mode - contains, beginsWith, endsWith
	 * @param bool $trim
	 * @return string bool
	 * @throws Exception
	 */
	public function render($haystack, $needle, $mode = 'contains', $trim = true) {
		if(!$haystack || !$needle) {
			return false;
		}
		if(method_exists($this, $mode)) {
			return $this->$mode($trim ? trim($haystack) : $haystack, $needle);
		} else {
//			throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception()
			throw new Exception("Chosen mode does not exist. Use contains, beginsWith or endsWith.");
//			return false;
		}
	}

	/**
	 * Returns true if $needle is found in $haystack
	 * @param $haystack
	 * @param $needle
	 * @return bool
	 */
	function contains($haystack, $needle) {
		if (strpos($haystack, $needle) !== FALSE) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Returns true if $haystack begins with $needle
	 * @param $haystack
	 * @param $needle
	 * @return bool
	 */
	function beginsWith($haystack, $needle) {
		// search backwards starting from haystack length characters from the end
		return $needle === "" || strrpos($haystack, $needle, -strlen($haystack)) !== FALSE;
	}

	/**
	 * Returns true if $haystack ends with $needle
	 * @param $haystack
	 * @param $needle
	 * @return bool
	 */
	function endsWith($haystack, $needle) {
		// search forward starting from end minus needle length characters
		return $needle === "" || (($temp = strlen($haystack) - strlen($needle)) >= 0 && strpos($haystack, $needle, $temp) !== FALSE);
	}
}