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wp-content/plugins/webp-express/vendor/rosell-dk/exec-with-fallback/src/ShellExec.php

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+<?php
+
+namespace ExecWithFallback;
+
+/**
+ * Emulate exec() with system()
+ *
+ * @package    ExecWithFallback
+ * @author     Bjørn Rosell <it@rosell.dk>
+ */
+class ShellExec
+{
+
+  /**
+   * Emulate exec() with shell_exec()
+   *
+   * @param string $command  The command to execute
+   * @param string &$output (optional)
+   * @param int &$result_code (optional)
+   *
+   * @return string | false   The last line of output or false in case of failure
+   */
+    public static function exec($command, &$output = null, &$result_code = null)
+    {
+        $resultCodeSupplied = (func_num_args() >= 3);
+        if ($resultCodeSupplied) {
+            throw new \Exception('ShellExec::exec() does not support $result_code argument');
+        }
+
+        $result = shell_exec($command);
+
+        // result:
+        // - A string containing the output from the executed command,
+        // - false if the pipe cannot be established
+        // - or null if an error occurs or the command produces no output.
+
+        if ($result === false) {
+            return false;
+        }
+        if (is_null($result)) {
+            // hm, "null if an error occurs or the command produces no output."
+            // What were they thinking?
+            // And yes, it does return null, when no output, which is confirmed in the test "echo hi 1>/dev/null"
+            // What should we do? Throw or accept?
+            // Perhaps shell_exec throws in newer versions of PHP instead of returning null.
+            // We are counting on it until proved wrong.
+            return '';
+        }
+
+        $theOutput = preg_split('/\s*\r\n|\s*\n\r|\s*\n|\s*\r/', $result);
+
+        // remove the last element if it is blank
+        if ((count($theOutput) > 0) && ($theOutput[count($theOutput) -1] == '')) {
+            array_pop($theOutput);
+        }
+
+        if (count($theOutput) == 0) {
+            return '';
+        }
+        if (gettype($output) == 'array') {
+            foreach ($theOutput as $line) {
+                $output[] = $line;
+            }
+        } else {
+            $output = $theOutput;
+        }
+        return $theOutput[count($theOutput) -1];
+    }
+}