preg_replace如何替换成preg_replace_callback-PHP Tutorial-php.cn

小弟以前从事Delphi开发，被社会所迫学习了PHP，今天当头一棒直接蒙了。
这个怎么改啊，程序报错需要将preg_replace替换成preg_replace_callback

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

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回复讨论(解决方案)

这太难了！！！！

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

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

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报错
Object of class Closure could not be converted to string

那你原来就报错

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

不过_getFieldTable要改一下了，因为接收的是一个数组了。

附源码，大神帮我看看

** * 获取查询时的字段列表 * * @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; } /** * 解析字段所属 * * @author Garbin * @param string $owner * @return string */ function _getFieldTable($owner) { if ($owner == 'this') { return $this->alias; } else { $m =& m($owner); if ($m === false) { /* 若没有对象，则原样返回 */ return $owner; } return $m->alias; } }

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15，16行我是用xuzuning大神的。

//$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;

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组合的查询语句是这个样子的

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]

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正确的应该是这个样子

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

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错误的问题是： user_priv.privs和user_priv.user_id和s.store_id重点引用“.”都没有了。

噢，漏了个点

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

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最后一个，谢谢xuzuning大神。最后面的preg_replace怎么替换

/** * 替换模块中图片路径 * * @author liupeng * @param string $source 内容 * @return string **/ function smarty_prefilter_preCompile($source) { $file_type = strtolower(strrchr($this->_current_file, '.')); $tmp_dir = '' ; /* 替换文件编码头部 */ if (strpos($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( '//', // 替换smarty注释 '//', // 替换不换行的html注释 '/(href=["|\'])\.\.\/(.*?)(["|\'])/i', // 替换相对链接 '/((?:background|src)\s*=\s*["|\'])(?:\.\/|\.\.\/)?(images\/.*?["|\'])/is', // 在images前加上 $tmp_dir '/((?:background|background-image):\s*?url\()(?:\.\/|\.\.\/)?(images\/)/is', // 在images前加上 $tmp_dir '/{nocache}(.+?){\/nocache}/ise', //无缓存模块 ); $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); }

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需要修改的只是最后一对：

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

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徐总给力啊，

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

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/e 就是 eval("return 串")
你脱去外层的引号就对了

function($r) {
return $this->select($r[1]);
}