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Philoreiser/Comparing an empty string with "zero".md

Last active May 20, 2021 15:04
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DO NOT compare a "string" value with a number
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Comparing an empty string with "zero".md 
<?php
$val = '';
echo ($val < 0) ? 1 : 0;
<?php
$val = '';
echo ($val == 0) ? 1 : 0;

PHP 7.2 與 8.0 兩種版本環境執行結果是不同的，應避免發生直接 空字串 與 0 (number) 比大小的可能。不同「型別」(概念上) 的兩個值做比較都要當心。

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