Missing constant INF

CHANGELOG.md

@@ -1,6 +1,9 @@
 CHANGE LOG
 ==========
 
+## 1.3.0 (2016-01-23)
+ - INF
+
 ## 1.2.0 (2016-01-03)
  - gzopen(), etc. are now part of symfony/polyfill
 

README.md

@@ -27,7 +27,7 @@ Add the dependency to your `composer.json` and allow autoloading magic to do the
 ```json
 {
     "require": {
-        "fisharebest/php-polyfill": "~1.2",
+        "fisharebest/php-polyfill": "~1.3",
     },
 }
 ```
@@ -58,6 +58,11 @@ status code, even if it was set using another function, such as `header()`.
 This implementation can only get the current status code if it was also set by
 `http_response_code()`.
 
+PHP (general)
+=============
+
+ - Some builds of PHP (such as the one used by strato.de) do not define INF.
+
 Contributions
 =============
 

src/Php.php

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * PHP Polyfill
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2016 Greg Roach
+ * @license   MIT or GPLv3+
+ */
+
+namespace Fisharebest\PhpPolyfill;
+
+use Symfony\Polyfill\Php54\Php54 as SymfonyPhp54;
+
+/**
+ * Class Php - polyfills for poor implementations of PHP
+ */
+class Php {
+	const BIG_ENDIAN_INF_BYTES    = '7ff0000000000000';
+	const LITTLE_ENDIAN_INF_BYTES = '000000000000f07f';
+
+	/**
+	 * Some builds of PHP (e.g. strato.de on SunOS) omit the
+	 * definition of INF.
+	 *
+	 * Note: we can't use hex2bin() on PHP 5.3.  Use pack('H*') instead.
+	 *
+	 * @link http://php.net/manual/en/math.constants.php
+	 *
+	 * @return double
+	 */
+	public static function inf() {
+		$inf_bytes = self::isLittleEndian() ? self::LITTLE_ENDIAN_INF_BYTES : self::BIG_ENDIAN_INF_BYTES;
+		$inf       = unpack('d', pack('H*', $inf_bytes));
+
+		return $inf[1];
+	}
+
+
+	/**
+	 * Is this CPU big-endian or little-endian?
+	 *
+	 * @return bool
+	 */
+	private static function isLittleEndian() {
+		$tmp = unpack('S',"\x01\x00");
+
+		return $tmp[1] === 1;
+	}
+}

src/bootstrap.php

@@ -8,13 +8,15 @@
  * @license   MIT or GPLv3+
  */
 
+use Fisharebest\PhpPolyfill\Php;
 use Fisharebest\PhpPolyfill\Php54;
 
 if (PHP_VERSION_ID < 50400) {
 	// Magic quotes were removed in PHP 5.4
 	if (get_magic_quotes_gpc()) {
 		Php54::removeMagicQuotes();
 	}
+
 	// The global session variable bug/feature was removed in PHP 5.4
 	if (ini_get('session.bug_compat_42')) {
 		ini_set('session.bug_compat_42', '0');
@@ -25,3 +27,7 @@
 		function http_response_code($reponse_code = null) { return Php54::httpResponseCode($reponse_code); }
 	}
 }
+
+if (!defined('INF')) {
+	define('INF', PHP::inf());
+}

tests/PhpTest.php

@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * PHP Polyfill
+ *
+ * @author        Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2016 Greg Roach
+ * @license       MIT or GPLv3+
+ */
+
+namespace Fisharebest\PhpPolyfill\Test;
+
+use Fisharebest\PhpPolyfill\Php;
+use PHPUnit_Framework_Error_Warning;
+use PHPUnit_Framework_TestCase;
+
+/**
+ * Class PhpTest - tests for class Php
+ */
+class PhpTest extends PHPUnit_Framework_TestCase {
+	/**
+	 * @covers Fisharebest\PhpPolyfill\Php::inf
+	 * @covers Fisharebest\PhpPolyfill\Php::isLittleEndian
+	 * @runInSeparateProcess
+	 */
+	public function testInf() {
+		$this->assertTrue(is_float(Php::inf()));
+		$this->assertTrue(is_double(Php::inf()));
+		$this->assertTrue(is_infinite(Php::inf()));
+		$this->assertFalse(is_finite(Php::inf()));
+	}
+}