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Issue #3277342: Fix substr issue for php8.

Serhii Puchkovskyi requested to merge issue/advagg-3277342:3277342-substr_backward_incompatible_change into 7.x-2.x

Closes #3277342

In PHP 7 substr returns the false but in PHP 8 it returns the '' empty string. It produces an issue when site can't be loaded if JShrink is used.

Current solution keeps backward compatibility.

See: https://www.php.net/manual/en/function.substr.php

Edited by Serhii Puchkovskyi

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