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xiaozi 2015-01-06 20:30:53

php中，`++$a` 和 `$a = $a + 1` 是一样的吗?

php php 
<?php

$a = '1d9';
echo ++$a . PHP_EOL; // 1e0

$b = '1d9';
$b = $b + 1;
echo $b . PHP_EOL; // 2

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