Add PHP 7.3 compatibility checks (only available if server is running PHP >= 5.3)

Author: Shawn Hooper

composer.json

@@ -7,12 +7,12 @@
 		"email": "[email protected]"
 	}],
 	"require": {
-		"squizlabs/php_codesniffer": "^2.9.1",
+		"squizlabs/php_codesniffer": "^2.9.2",
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.4.4",
-		"phpcompatibility/phpcompatibility-wp": "^1"
+		"phpcompatibility/phpcompatibility-wp": "^2"
 	},
 	"require-dev": {
-		"wp-coding-standards/wpcs": "dev-master"
+		"wp-coding-standards/wpcs": "^1"
 	},
 	"scripts": {
 		"post-update-cmd": [

composer.lock

@@ -109,13 +109,17 @@ public static function init() {
 	 * @return array Associative array of available PHP versions.
 	 */
 	function get_phpversions() {
+
 		$versions = array(
-			'PHP 7.3' => '7.3',
 			'PHP 7.2' => '7.2',
 			'PHP 7.1' => '7.1',
 			'PHP 7.0' => '7.0',
 		);
 
+		if ( version_compare( phpversion(), '5.3', '>=' ) ) {
+		    $versions = array( 'PHP 7.3' => '7.3') + $versions;
+		}
+
 		$old_versions = array( '5.6', '5.5', '5.4', '5.3' );
 
 		while ( ! empty( $old_versions ) ) {