我如何显示多维数组（2D、3D、4D 等），例如 var_dump，在 PHP 中循环和回显？

Question

这是我的数组：

$arr=array(
    array(
      array(array( "value1", "value2" ), "value2" ),
      array( "value3", "value4" )
    ),
    array(
      array( "value5", "value6" ),
      array( "value7", "value8" )
    )
  );

如果我们用 var_dump 打印它，它显示如下：

array(2) {
  [0]=>
  array(2) {
    [0]=>
    array(2) {
      [0]=>
      array(2) {
        [0]=>
        string(6) "value1"
        [1]=>
        string(6) "value2"
      }
      [1]=>
      string(6) "value2"
    }
    [1]=>
    array(2) {
      [0]=>
      string(6) "value3"
      [1]=>
      string(6) "value4"
    }
  }
  [1]=>
  array(2) {
    [0]=>
    array(2) {
      [0]=>
      string(6) "value5"
      [1]=>
      string(6) "value6"
    }
    [1]=>
    array(2) {
      [0]=>
      string(6) "value7"
      [1]=>
      string(6) "value8"
    }
  }
}

我想写一个函数，它可以打印 每个多维数组 只有回声和循环，我该怎么做？

这是我的代码：

function recursive($array)
    {
        foreach ($array as $key => $value) {
            //If $value is an array.
            if (is_array($value)) {
                //We need to loop through it.
                recursive($value);
            } else {
                if (gettype($value)!=="string") {
                    //It is not an array, so print it out.
                    echo $key . ": " .gettype($value).count($value). $value, '<br>';
                } else {
                    echo "[".$key . "]=>" .gettype($value)."(".strlen($value).") \"". $value."\"", '<br>';
                }
            }
        }
    }
    recursive($arr);

这是输出：

[0]=>string(6) "value1"
[1]=>string(6) "value2"
[1]=>string(6) "value2"
[0]=>string(6) "value3"
[1]=>string(6) "value4"
[0]=>string(6) "value5"
[1]=>string(6) "value6"
[0]=>string(6) "value7"
[1]=>string(6) "value8"

此代码无法像 var_dump 那样打印！

我想通过我的功能像 var_dump 一样打印，我该怎么做？

Answer 1

function var_debug($variable,$strlen=100,$width=25,$depth=10,$i=0,&$objects = array())
{
  $search = array("[=10=]", "\a", "\b", "\f", "\n", "\r", "\t", "\v");
  $replace = array('[=10=]', '\a', '\b', '\f', '\n', '\r', '\t', '\v');

  $string = '';

  switch(gettype($variable)) {
    case 'boolean':      $string.= $variable?'true':'false'; break;
    case 'integer':      $string.= $variable;                break;
    case 'double':       $string.= $variable;                break;
    case 'resource':     $string.= '[resource]';             break;
    case 'NULL':         $string.= "null";                   break;
    case 'unknown type': $string.= '???';                    break;
    case 'string':
      $len = strlen($variable);
      $variable = str_replace($search,$replace,substr($variable,0,$strlen),$count);
      $variable = substr($variable,0,$strlen);
      if ($len<$strlen) $string.= '"'.$variable.'"';
      else $string.= 'string('.$len.'): "'.$variable.'"...';
      break;
    case 'array':
      $len = count($variable);
      if ($i==$depth) $string.= 'array('.$len.') {...}';
      elseif(!$len) $string.= 'array(0) {}';
      else {
        $keys = array_keys($variable);
        $spaces = str_repeat(' ',$i*2);
        $string.= "array($len)\n".$spaces.'{';
        $count=0;
        foreach($keys as $key) {
          if ($count==$width) {
            $string.= "\n".$spaces."  ...";
            break;
          }
          $string.= "\n".$spaces."  [$key] => ";
          $string.= var_debug($variable[$key],$strlen,$width,$depth,$i+1,$objects);
          $count++;
        }
        $string.="\n".$spaces.'}';
      }
      break;
    case 'object':
      $id = array_search($variable,$objects,true);
      if ($id!==false)
        $string.=get_class($variable).'#'.($id+1).' {...}';
      else if($i==$depth)
        $string.=get_class($variable).' {...}';
      else {
        $id = array_push($objects,$variable);
        $array = (array)$variable;
        $spaces = str_repeat(' ',$i*2);
        $string.= get_class($variable)."#$id\n".$spaces.'{';
        $properties = array_keys($array);
        foreach($properties as $property) {
          $name = str_replace("[=10=]",':',trim($property));
          $string.= "\n".$spaces."  [$name] => ";
          $string.= var_debug($array[$property],$strlen,$width,$depth,$i+1,$objects);
        }
        $string.= "\n".$spaces.'}';
      }
      break;
  }

  if ($i>0) return $string;

  $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS);
  do $caller = array_shift($backtrace); while ($caller && !isset($caller['file']));
  if ($caller) $string = $caller['file'].':'.$caller['line']."\n".$string;

  echo $string;
}

https://3v4l.org/aCmrD

信用：https://www.leaseweb.com/labs/2013/10/smart-alternative-phps-var_dump-function/

我如何显示多维数组（2D、3D、4D 等），例如 var_dump，在 PHP 中循环和回显？

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