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  1. <?php
  2.  
  3. $strXml = '<data>
  4.     <task id="1">
  5.         <parent>0</parent>
  6.     </task>
  7.     <task id="2">
  8.         <parent>-1</parent>
  9.     </task>
  10.     <task id="3">
  11.         <parent>-1</parent>
  12.     </task>
  13.     <task id="4">
  14.         <parent>0</parent>
  15.     </task>
  16.     <task id="5">
  17.         <parent>-1</parent>
  18.     </task>
  19.     <task id="6">
  20.         <parent>-1</parent>
  21.     </task>
  22.     <task id="7">
  23.         <parent>0</parent>
  24.     </task>
  25.     <task id="8">
  26.         <parent>-1</parent>
  27.     </task>
  28.     <task id="9">
  29.         <parent>-1</parent>
  30.     </task>
  31. </data>';
  32.  
  33. $convertedXML = new SimpleXMLElement($strXml);
  34. $i = 0;
  35. foreach($convertedXML as $task) {
  36. 	if($convertedXML->task[$i]) {
  37. 		$id = (string) $task["id"];
  38. 		$parent = (string) $task->parent;
  39. 		$task->parent = ($parent == 0) ? 0 : $back_parent;
  40. 		$back_parent = ($parent == 0) ? $id : $back_parent;
  41. 		$i++;
  42. 	}
  43. }
  44. echo $convertedXML->saveXML();
  45.  
  46. ?>
Success #stdin #stdout 0.01s 24400KB
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<?xml version="1.0"?>
<data>
    <task id="1">
        <parent>0</parent>
    </task>
    <task id="2">
        <parent>1</parent>
    </task>
    <task id="3">
        <parent>1</parent>
    </task>
    <task id="4">
        <parent>0</parent>
    </task>
    <task id="5">
        <parent>4</parent>
    </task>
    <task id="6">
        <parent>4</parent>
    </task>
    <task id="7">
        <parent>0</parent>
    </task>
    <task id="8">
        <parent>7</parent>
    </task>
    <task id="9">
        <parent>7</parent>
    </task>
</data>
https://ideone.com/sVCQYd
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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