How to Fix \'Illegal Offset Type\' Error When Using Objects or Arrays as Index Keys in PHP?

Troubleshooting "Illegal Offset Type" Error in PHP Arrays

When attempting to manipulate arrays in PHP, you may encounter the "illegal offset type" error. This error occurs when you try to use an object or an array as an index key for an array.

For example:

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

In your specific case, the error is being triggered by the following code snippet:

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

The error is occurring because the $source variable is an object or array for some value of $i. To resolve this issue, you need to ensure that $xml contains the expected data and that you're accessing it correctly.

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