发送"var_dump"到FireBug控制台 [英] Sending "var_dump" to FireBug console

问题描述

如您所知，var_dump()除了显示值外，还显示其数据类型和长度.

As you know var_dump() in addition to value show its data type and length.

是否可以将其输出记录到 FireBug控制台?

Is there any way to log its output to FireBug console?

我尝试了 FirePHP 和 FireLogger ，但是两者都仅输出变量的值(有时甚至输出不正确的变量值).

I tried FirePHP and FireLogger but both output only value of a variable (sometimes even incorrect variable value).

推荐答案

也许您需要的是这样的东西:

Maybe what you need is something like this:

function var2console($var, $name='', $now=false)
{
   if ($var === null)          $type = 'NULL';
   else if (is_bool    ($var)) $type = 'BOOL';
   else if (is_string  ($var)) $type = 'STRING['.strlen($var).']';
   else if (is_int     ($var)) $type = 'INT';
   else if (is_float   ($var)) $type = 'FLOAT';
   else if (is_array   ($var)) $type = 'ARRAY['.count($var).']';
   else if (is_object  ($var)) $type = 'OBJECT';
   else if (is_resource($var)) $type = 'RESOURCE';
   else                        $type = '???';
   if (strlen($name)) {
      str2console("$type $name = ".var_export($var, true).';', $now);
   } else {
      str2console("$type = "      .var_export($var, true).';', $now);
   }
}

function str2console($str, $now=false)
{
   if ($now) {
      echo "<script type='text/javascript'>\n";
      echo "//<![CDATA[\n";
      echo "console.log(", json_encode($str), ");\n";
      echo "//]]>\n";
      echo "</script>";
   } else {
      register_shutdown_function('str2console', $str, true);
   }
}

用法:var2console($myvar, '$myvar');或仅var2console($myvar);

几乎没有必要将$now参数设置为true，从而导致立即输出<script>标记.使用 register_shutdown_function() 的好处是您不需要无需注意HTML中的您所在的位置".

It should very rarely be necessary to set the $now parameter to true, causing the immediate output of the <script> tag. The advantage of using register_shutdown_function() is that you don't need to pay attention to "where you are" in the HTML.

json_encode() 保留传输中的所有字符从PHP到JavaScript.唯一需要注意的是关于编码:json_encode()仅与UTF-8一起使用(无论如何，在大多数情况下，这是推荐的编码).您可能需要类似 utf8_encode() 或 mb_convert_encoding() (如果您使用其他编码(或者，您可以考虑切换到UTF-8).

The json_encode() preserves all characters in the transfer from PHP to JavaScript. The only caveat is about encoding: json_encode() only works with UTF-8 (which is the recommended encoding in most cases, anyway). You may need something like utf8_encode() or mb_convert_encoding() if you use a different encoding (or rather, you may consider switching to UTF-8).

Firebug控制台的输出只是 var_export() ，其后是变量的类型，包括字符串的长度和数组的数量，以及变量的名称(可选).

The output to Firebug's console is simply the output of var_export(), preceded by the type of the variable, including the length of strings and the count of arrays, and, optionally, by the name of the variable.

var_export()提供的输出比 var_dump() .如果您确实需要var_dump()的输出，则可以使用以下内容:

var_export() provides a more readable output than var_dump(). If you really need the output of var_dump(), you can use something like this:

function dump2console($var, $name='', $now=false)
{
   ob_start();
   if (strlen($name)) {
      echo "$name =\n";
   }
   var_dump($var);
   $str = ob_get_clean();
   str2console($str, $now);
}

用法:dump2console($myvar, '$myvar');或只是dump2console($myvar);

您应避免使用循环引用(var_dump()检测它们的步骤为时已晚，而var_export()根本不会检测到它们).例如，对于$GLOBALS:

You should avoid circular references (var_dump() detects them a step too late, and var_export() doesn't detect them at all). This is how to do it, e.g., for $GLOBALS:

function globals2console($now=false)
{
   $g = $GLOBALS;
   $g['GLOBALS'] = '(recursion)';
   var2console($g, '$GLOBALS', $now);
}

这篇关于发送"var_dump"到FireBug控制台的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！