php - How do I access a variable inside of preg_replace_callback? -

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i'm trying replace {{key}} items in $text values passed array. when tried adding print_r see going on got undefined variable: kvpairs error. how can access variable form within preg_replace_callback?

public function replacevalues($kvpairs, $text) {     $text = preg_replace_callback(         '/(\{{)(.*?)(\}})/',         function ($match) {             $attr = trim($match[2]);             print_r($kvpairs[strtolower($attr)]);             if (isset($kvpairs[strtolower($attr)])) {                 return "<span class='attr'>" . $kvpairs[strtolower($attr)] . "</span>";             } else {                 return "<span class='attrunknown'>" . $attr . "</span>";             }         },         $text     );     return $text; }

update:

i've tried global scope thing, doesn't work either. i've added 2 print statements see whats doing on, 1 inside , 1 outside preg_replace_callback.

public function replacevalues($kvpairs, $text) {     $attrtest = 'date';     print_r("--" . strtolower($attrtest) . "--" . $kvpairs[strtolower($attrtest)] . "--\n");     $text = preg_replace_callback(         '/(\{{)(.*?)(\}})/',         function ($match) {             global $kvpairs;             $attr = trim($match[2]);             print_r("==" . strtolower($attr) . "==" . $kvpairs[strtolower($attr)] . "==\n");             if (isset($kvpairs[strtolower($attr)])) {                 return "<span class='attr'>" . $kvpairs[strtolower($attr)] . "</span>";             } else {                 return "<span class='attrunknown'>" . $attr . "</span>";             }         },         $text     );     return $text; }

the output is:

--date--1977-05-20-- ==date====

as callback function closure, can pass arguments via use

function ($match) use ($kvpairs) {     ... }

better polluting global space


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