Produce a warning in the report when a non-PHP 7 binary is used.

classes/tests.php

@@ -113,6 +113,20 @@ public function testLine($line) {
 		return $issues;
 	}
 
+	/**
+	 * Return the PHP binary location.
+	 *
+	 * @access	public
+	 * @return	string	PHP binary location.
+	 */
+	public function getPHPBinaryPath() {
+		$binary = 'php';
+		if ($this->php !== null) {
+			$binary = $this->php;
+		}
+		return $binary;
+	}
+
 	/**
 	 * Set the location of the PHP binary.
 	 *
@@ -124,6 +138,21 @@ public function setPHPBinaryPath($path) {
 		$this->php = $path;
 	}
 
+	/**
+	 * Return the version of PHP for the selected binary.
+	 *
+	 * @access	public
+	 * @return	mixed	Version string or false on error.
+	 */
+	public function getPHPVersion() {
+		$binary = $this->getPHPBinaryPath();
+		$version = exec($binary.' -r "echo(phpversion());" 2>&1', $version);
+
+		$version = trim($version);
+
+		return version_compare($version, "7.0.0-dev", ">=");
+	}
+
 	/**
 	 * Check if syntax is valid and return line information if not.
 	 *
@@ -132,10 +161,7 @@ public function setPHPBinaryPath($path) {
 	 * @return	array	Test Results
 	 */
 	public function checkSyntax($filePath) {
-		$binary = 'php';
-		if ($this->php !== null) {
-			$binary = $this->php;
-		}
+		$binary = $this->getPHPBinaryPath();
 		exec($binary.' -l '.$filePath.' 2>&1', $output);
 
 		$syntax = [];

mar.php

@@ -106,6 +106,10 @@ private function run() {
 		$filePath = $this->scanner->getCurrentFilePath();
 		if (!$this->options->getOption('t') || in_array('syntax', $this->options->getOption('t'), true)) {
 			$checkSyntax = true;
+			$versionGood = $this->tests->getPHPVersion();
+			if (!$versionGood) {
+				$this->reporter->add("ERROR!  Syntax checking was selected and a PHP binary lower than 7.0.0-dev was specified.", 0, 1);
+			}
 		} else {
 			$checkSyntax = false;
 		}