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wp-content/plugins/webp-express/vendor/rosell-dk/file-util/src/FileExistsUsingExec.php

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+<?php
+
+namespace FileUtil;
+
+use ExecWithFallback\ExecWithFallback;
+
+/**
+ * A fileExist implementation using exec()
+ *
+ * @package    FileUtil
+ * @author     Bjørn Rosell <it@rosell.dk>
+ */
+class FileExistsUsingExec
+{
+
+    /**
+     * A fileExist based on an exec call.
+     *
+     * @throws \Exception  If exec cannot be called
+     * @return boolean|null  True if file exists. False if it doesn't.
+     */
+    public static function fileExists($path)
+    {
+        if (!ExecWithFallback::anyAvailable()) {
+            throw new \Exception(
+                'cannot determine if file exists using exec() or similar - the function is unavailable'
+            );
+        }
+
+        // Lets try to find out by executing "ls path/to/cwebp"
+        ExecWithFallback::exec('ls ' . $path, $output, $returnCode);
+        if (($returnCode == 0) && (isset($output[0]))) {
+            return true;
+        }
+
+        // We assume that "ls" command is general available!
+        // As that failed, we can conclude the file does not exist.
+        return false;
+    }
+}