用PHP代码替换字符串

我需要在字符串中找到一个字符串（“foo”，例如），然后用PHP代码替换它。可能吗

我正在创建一个Joomla插件。当我的文章有类似于“{foo}”的内容时，我将用include（require，或其他什么）替换它

我做了一些类似于：

public function onContentBeforeDisplay($context, &$row, &$params, $page=0)
    {
        // $row->text has the article text ...
        if (preg_match('/{contact-form}/', $row->text))
        {
            require_once(dirname(__FILE__) . DS . 'tmpl' . DS . 'default.php');
        }
    }

但这段代码将在开头插入default.php。我想在{contact form}标记中替换它

---

谢谢。

您可以使用PHP函数“

substr\u replace（）

”，其详细信息如下所示。 \n”

/*这两个示例将所有$var替换为“bob”*/
echo substr\u replace（$var，'bob'，0）。“
\n”；
echo substr_replace（$var，'bob'，0，strlen（$var））。“
\n”；
/*在$var开头插入'bob'*/
echo substr\u replace（$var，'bob'，0，0）。“
\n”；
/**
*您的食物和搜索在这里
*/
/*接下来的两个将$var中的“MNRPQR”替换为“bob”*/
回波子序列替换（$var，'bob'，10，-1）。“
\n”；
echo substr\u replace（$var，'bob'，-7，-1）。“
\n”；
/*从$var中删除'MNRPQR'*/
回波子序列替换（$var'，10，-1）。“
\n”；
?>

您可以创建一个与关键字匹配的PHP文件（如：foo.PHP），只需从文本中提取关键字并使用它包含该文件

例如：

<?php
$str = "This is {foo} text";
$includePath = "/path/to/my/files/";

// Careful with the Regular Expression. If you allow chars like . in the
// keyword this could create a security problem. (Dots allow you to go backwards
// which would allow people to execute files outside your path.)
if (preg_match_all('/\{([\w]+)\}/', $str, $matches))
{
    foreach ($matches[1] as $_match)
    {
        $filePath = $includePath . $_match . ".php";
        if (file_exists($filePath))
        {
            include $filePath;
        }
        else
        {
            trigger_error("File does not exist '$filePath'.", E_USER_WARNING);
        }
    }
}
?>

---

我想你只是想要这个，不是吗

<?php

$replacement = file_get_contents('myfile.php');

$content = str_replace('{foo}', eval($replacement), $content);

?>

如果您需要替换远程服务器上的一系列文件中的任何字符串，而且您没有时间，那么这里是您的解决方案，我希望它可以帮助其他人

 ////
 //PHP 5.3 + Class find and replace string in files
 //
 //by Bruce Afruz 
 //
 //2013
 //
 //example usage for single file:
 //
 //$new = new fileReplacement('./');
 //$new->setExt("check.php");
 //$new->changeContents("hello", "goodbye");
 //
 //example usage for multiple files:
 //
 //$new = new fileReplacement('./test');
 //$new->setExt("*.html");
 //$new->changeContents("hello", "goodbye");
 //
 //to change directory:
 //
 //$new = new fileReplacement('./test');
 //$new->setDir("./test2");
 //$new->setExt("*.html");
 //$new->changeContents("hello", "goodbye");
 ////


 class fileReplacement 
 {
  private $ext , $dir ;
  public function getDir() {
   return $this->dir;
  }
  public function setDir($dir) {
   $this->dir = $dir;
  }
   public function getExt() {
   return $this->ext;
  }
  public function setExt($ext) {
   $this->ext = $ext;
  }
 function __construct($dir) {
   $this->dir = $dir;
  }

  public function rglob($pattern = '*', $flags = 0, $path = '') {

  chdir($this->getDir());
  $paths = glob($path . '*', GLOB_MARK | GLOB_ONLYDIR | GLOB_NOSORT);
  $files = glob($path . $pattern, $flags);
  foreach ($paths as $path) {
  $files = array_merge($files, $this->rglob($pattern, $flags, $path));
  }
  return $files;
 }

 public function changeContents($replace , $sentence , $flags = 0, $path = '') {
 $all = $this->rglob($this->getExt() , $flags, $path);
 foreach ($all as $file) {

  $filename = $file;
  $handle = fopen($filename, "r");
  $contents = fread($handle, filesize($filename));
  fclose($handle);
  $contents = str_replace($replace , $sentence, $contents);

  if (is_writable($filename)) {
   if (!$handle = fopen($filename, 'w+')) {
    echo "Cannot open file ($filename)
";
    exit;
   }

   // Write $contents to our opened file.
   if (fwrite($handle, $contents) === FALSE) {
    echo "Cannot write to file ($filename)
";
    exit;
   }

   echo "Success, wrote content to file ($filename)
";

   fclose($handle);
  } else {
   echo "The file $filename is not writable
";
  }
 }
 }}

你能解释一下你的问题的背景并提供一个例子吗？你试过了吗？@deceze这个问题被标记为str replace，你几乎会认为OP首先检查了文档……不是吗？；-）str_replace添加了代码而没有评估它。@rich Good point.：o）@thom你为什么不先运行代码并替换
{foo}
运行代码的结果是什么？
 ////
 //PHP 5.3 + Class find and replace string in files
 //
 //by Bruce Afruz 
 //
 //2013
 //
 //example usage for single file:
 //
 //$new = new fileReplacement('./');
 //$new->setExt("check.php");
 //$new->changeContents("hello", "goodbye");
 //
 //example usage for multiple files:
 //
 //$new = new fileReplacement('./test');
 //$new->setExt("*.html");
 //$new->changeContents("hello", "goodbye");
 //
 //to change directory:
 //
 //$new = new fileReplacement('./test');
 //$new->setDir("./test2");
 //$new->setExt("*.html");
 //$new->changeContents("hello", "goodbye");
 ////


 class fileReplacement 
 {
  private $ext , $dir ;
  public function getDir() {
   return $this->dir;
  }
  public function setDir($dir) {
   $this->dir = $dir;
  }
   public function getExt() {
   return $this->ext;
  }
  public function setExt($ext) {
   $this->ext = $ext;
  }
 function __construct($dir) {
   $this->dir = $dir;
  }

  public function rglob($pattern = '*', $flags = 0, $path = '') {

  chdir($this->getDir());
  $paths = glob($path . '*', GLOB_MARK | GLOB_ONLYDIR | GLOB_NOSORT);
  $files = glob($path . $pattern, $flags);
  foreach ($paths as $path) {
  $files = array_merge($files, $this->rglob($pattern, $flags, $path));
  }
  return $files;
 }

 public function changeContents($replace , $sentence , $flags = 0, $path = '') {
 $all = $this->rglob($this->getExt() , $flags, $path);
 foreach ($all as $file) {

  $filename = $file;
  $handle = fopen($filename, "r");
  $contents = fread($handle, filesize($filename));
  fclose($handle);
  $contents = str_replace($replace , $sentence, $contents);

  if (is_writable($filename)) {
   if (!$handle = fopen($filename, 'w+')) {
    echo "Cannot open file ($filename)
";
    exit;
   }

   // Write $contents to our opened file.
   if (fwrite($handle, $contents) === FALSE) {
    echo "Cannot write to file ($filename)
";
    exit;
   }

   echo "Success, wrote content to file ($filename)
";

   fclose($handle);
  } else {
   echo "The file $filename is not writable
";
  }
 }
 }}