How to Resolve the \'Illegal Offset Type\' Error in PHP When Iterating Through Arrays?

Fixing Illegal Offset Type Error

Problem:

You encounter an "illegal offset type" error while iterating through an array, accessing elements using objects or arrays as index keys. Here's an example code that triggers the error:

<code class="php">$s = array();
for($i = 0; $i < 20; $i++){
    $source = $xml->entry[$i]->source;
    $s[$source] += 1;    
}

print_r($s);</code>

Answer:

Illegal offset type errors occur when accessing array indexes using objects or arrays as index keys.

<code class="php">$x = new stdClass();
$arr = array();
echo $arr[$x]; // Example: Illegal offset type</code>

In your code, the error occurs because $xml->entry[$i]->source may be an object or an array for some values of $i. When you try to use it as an index key for $s, you encounter the illegal offset type error.

To resolve this, verify the contents and structure of $xml to ensure you're accessing it correctly and that it contains what you expect it to.

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