Description:
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PHP 7.0.1 Thread Safe on Windows Throws String convertion error.

This happened when I tried to access database object 

Test script:
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$obj = $db->results();

$arr = ['tbfield1', 'tbfield2', 'tbfield3'];

// Get column tbfield1
$getColumnArray = $obj->$arr[0]; // Then PHP 7.0.1 throws error String convertion error



Expected result:
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Return array of column from PHP stdClass

Actual result:
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ErrorException: Array to string conversion