Description:
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Error occurs while implicit string to integer conversion, which should be performed by the prefix incermention. The ++ operator takes the input string as such and... "increments" the last character of the string. Error faced with PHP 5.2.0, 5.2.3 and 5.2.6. The test case was inspired by the Zend Certification Book :)

Reproduce code:
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$a = 'Test';
echo ++$a;

Expected result:
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1

Actual result:
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Tesu