Wordwrap Kata in PHP. See: http://sites.google.com/site/tddproblems/all-problems-1/word-wrapping

gistfile1.aw

<?php
class WordWrapTest extends PHPUnit_Framework_TestCase {
	public function testDoNotWrapWhenNoText() {
		$text = "";

		$actual = word_wrap($text, 60);

		$this->assertEquals("", $actual);
	}

	public function testNoWrapWhenTextSmallerThanRowLength() {
		$text = "This fits!";
		$actual = word_wrap($text, 60);
		$this->assertEquals($text, $actual);
	}

	public function testNoWrapWhenTextFitsExactlyInRow() {
		$text = "1234567890";
		$actual = word_wrap($text, 10);
		$this->assertEquals($text, $actual);
	}

	public function testWrapWhenRowLengthSameAsFirstWordLength() {
		$text = "abc def";
		$actual = word_wrap($text, 3);
		$expected = array("abc", "def");
		$this->assertEquals($expected, $actual);
	}

	public function testWrapWhenRowLengthShorterThanFirstWordLength() {
		$text = "abcdef";
		$actual = word_wrap($text, 3);
		$expected = array("abc", "def");
		$this->assertEquals($expected, $actual);
	}

	public function testWrapTwoWords() {
		$text = "abcdef ghi";
		$actual = word_wrap($text, 3);
		$expected = array("abc", "def", "ghi");

		$this->assertEquals($expected, $actual);
	}

	public function testWrapLotsOfSingleLetterWords() {
		$text = "a b c d e f";
		$actual = word_wrap($text, 3);
		$expected = array("a b", "c d", "e f");

		$this->assertEquals($expected, $actual);

	}
}


function word_wrap($text, $row_length) {
	if(strlen($text) <= $row_length) {
		return $text;
	} else {
		$lines = array();
		while($text) {
			$lines[] = trim(substr($text, 0, $row_length));
			$text = trim(substr($text, $row_length));
		}
		return $lines; 
	}
}