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diff --git a/node_modules/locutus/php/array/array_keys.js b/node_modules/locutus/php/array/array_keys.js
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+'use strict';
+
+module.exports = function array_keys(input, searchValue, argStrict) {
+  // eslint-disable-line camelcase
+  //  discuss at: http://locutus.io/php/array_keys/
+  // original by: Kevin van Zonneveld (http://kvz.io)
+  //    input by: Brett Zamir (http://brett-zamir.me)
+  //    input by: P
+  // bugfixed by: Kevin van Zonneveld (http://kvz.io)
+  // bugfixed by: Brett Zamir (http://brett-zamir.me)
+  // improved by: jd
+  // improved by: Brett Zamir (http://brett-zamir.me)
+  //   example 1: array_keys( {firstname: 'Kevin', surname: 'van Zonneveld'} )
+  //   returns 1: [ 'firstname', 'surname' ]
+
+  var search = typeof searchValue !== 'undefined';
+  var tmpArr = [];
+  var strict = !!argStrict;
+  var include = true;
+  var key = '';
+
+  for (key in input) {
+    if (input.hasOwnProperty(key)) {
+      include = true;
+      if (search) {
+        if (strict && input[key] !== searchValue) {
+          include = false;
+        } else if (input[key] !== searchValue) {
+          include = false;
+        }
+      }
+
+      if (include) {
+        tmpArr[tmpArr.length] = key;
+      }
+    }
+  }
+
+  return tmpArr;
+};
+//# sourceMappingURL=array_keys.js.map
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