How to replace preg_replace with preg_replace_callback

How to replace preg_replace with preg_replace_callback: my younger brother was engaged in Delphi development and was forced to learn PHP by the society. today, I am overwhelmed.
How can this problem be solved? if the program reports an error, replace preg_replace with preg_replace_callback.

$fields = preg_replace('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/e', "\$this->_getFieldTable('\\1') . '.\\2'", $fields);

Reply to discussion (solution)

This is too difficult !!!!

$fields = preg_replace('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/', function($r) {  return $this->_getFieldTable($r[1]) . $r[2];  }, $fields);

$fields = preg_replace('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/', function($r) {  return $this->_getFieldTable($r[1]) . $r[2];  }, $fields);

Error
Object of class Closure cocould not be converted to string

Then you would have reported an error.

$ Fields = preg_replace_callback ('/([a-zA-Z0-9 _] + )\. ([a-zA-Z0-9 _ *] +)/', array ($ this, "_ getFieldTable"), $ fields );

However, you have to modify _ getFieldTable because it receives an array.

With source code, please help me see

* ** Obtain the field list during query ** @ author Garbin * @ param string $ src_fields_list * @ return string */function getRealFields ($ src_fields_list) {$ fields = $ src_fields_list; if (! $ Src_fields_list) {$ fields = '';} // $ fields = preg_replace ('/([a-zA-Z0-9 _] + )\. ([a-zA-Z0-9 _ *] +)/E', "\ $ this-> _ getFieldTable ('\ 1 '). '. \ 2 '", $ fields); $ fields = preg_replace_callback ('/([a-zA-Z0-9 _] + )\. ([a-zA-Z0-9 _ *] +)/', function ($ r) {return $ this-> _ getFieldTable ($ r [1]). $ r [2] ;}, $ fields); // $ fields = preg_replace_callback ('/([a-zA-Z0-9 _] + )\. ([a-zA-Z0-9 _ *] +)/', function ($ r) {return $ this-> _ getFieldTable ($ r (1 ). $ r (2) ;}, $ fields); return $ fields ;} /*** resolve the field ** @ author Garbin * @ param string $ owner * @ return string */function _ getFieldTable ($ owner) {if ($ owner = 'eas') {return $ this-> alias;} else {$ m = & m ($ owner ); if ($ m = false) {/* if no object exists, return the original */return $ owner;} return $ m-> alias ;}}

Lines 15 and 16 I use xuzuning.

        //$fields = preg_replace('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/e', "\$this->_getFieldTable('\\1') . '.\\2'", $fields);        $fields = preg_replace_callback('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/', function($r) {return $this->_getFieldTable($r[1]) . $r[2];}, $fields);           //$fields = preg_replace_callback('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/',function($r){ return $this->_getFieldTable($r(1) . $r(2));}, $fields);        return $fields;

The combined query statement looks like this.

MySQL Error[1054]: Unknown column 'user_privprivs' in 'field list' MySQL Query:SELECT user_privprivs, sstore_name,user_privuser_id,s.store_id FROM ecm_store s LEFT JOIN ecm_user_priv user_priv ON s.store_id = user_priv.store_id WHERE user_priv.user_id IN ('1') ORDER BY sstore_id DESC Wrong File: \eccore\model\mysql.php[534]

This should be the correct one.

SELECT user_priv.privs, s.store_name,user_priv.user_id,s.store_id FROM ecm_store s LEFT JOIN ecm_user_priv user_priv ON s.store_id = user_priv.store_id WHERE user_priv.user_id IN ('1') ORDER BY s.store_id DESC

The error is: user_priv.privs, user_priv.user_id, and s. store_id cannot be referenced.

Oh, missed a point.

$fields = preg_replace('/([a-zA-Z0-9_]+)\.([a-zA-Z0-9_*]+)/', function($r) {  return $this->_getFieldTable($r[1]) . ".$r[2]";  }, $fields);

Last one, thank you, xuzuning. How to replace preg_replace

/*** Replace the image path in the module ** @ author liupeng * @ param string $ source content * @ return string **/function smarty_prefilter_preCompile ($ source) {$ file_type = strtolower (strrchr ($ this-> _ current_file ,'. '); $ tmp_dir = '';/* replace the file encoding header */if (strpos ($ source," \ xEF \ xBB \ xBF ")! = FALSE) {$ source = str_replace ("\ xEF \ xBB \ xBF", '', $ source);} if ($ this-> store_id> 0) {if (strpos ($ this-> _ current_file, '/mall/resource ')! = False) {$ mall_skin = $ this-> options ['Mall _ skin']; $ tmp_dir = "themes/mall/skin/$ mall_skin /";} else {$ tmp_dir = "themes/store/skin /". $ this-> skin. '/';} else {$ tmp_dir = "themes/mall/skin /". $ this-> skin. '/';} $ pattern = array ('/
 /', // Replace the smarty comment '/
 /', // Replace the html comment without line breaks'/(href = ["| \ ']) \. \. \/(. *?) (["| \ '])/I', // replace the relative link '/((? : Background | src) \ s * = \ s * ["| \ ']) (? : \. \/| \.\.\/)? (Images \/.*? ["| \ '])/Is', // add $ tmp_dir '/((? : Background | background-image): \ s *? Url \()(? : \. \/| \.\.\/)? (Images \/)/is ', // add $ tmp_dir'/{nocache} (. +?) to images ?) {\/Nocache}/ise ', // no Cache module); $ replace = array (' \ 1', '', '\ 1 \ 2 \ 3 ', '\ 1 '. $ tmp_dir. '\ 2',' \ 1 '. $ tmp_dir. '\ 2', "' {insert name = \" nocache \"'. '". $ this-> _ echash. "'. base64_encode ('\ 1 '). '}' ",); return preg_replace ($ pattern, $ replace, $ source );}

You only need to modify the last pair:

$source = preg_replace_callback( '/{nocache}(.+?){\/nocache}/is', function($r) {    return '{insert name="nocache" '  . $this->_echash .  base64_encode($r[1]) . '}'; }, $source);

Eric Xu is awesome,

    function fetch_str($source)    {        if (!defined('IS_BACKEND'))        {            $source = $this->smarty_prefilter_preCompile($source);        }        return preg_replace("/{([^\}\{\n]*)}/e", "\$this->select('\\1');", $source);    }

/E is eval ("return string ")
You can just remove the outer quotation marks.

Function ($ r ){
Return $ this-> select ($ r [1]);
}