<?php
$string_a = '1245';
$res = $string_a['adb']?:0;
echo $res;
?>
运行结果是 1，知道的大佬解释一下
$string_a = '1245';
$res = $string_a['adb']?:0;
echo $res;
?>
运行结果是 1，知道的大佬解释一下
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