php中如何直接在引号里引用变量？
本文共 363 字，大约阅读时间需要 1 分钟。
测试环境： ThinkPHP5.1
错误示范：（原本想field里的xd$ i的值依次为xd1\xd2\xd3…，此处七次循环均将其值当做了xd$ i）for($i=1;$i<8;$i++){ $number= RcxdModel::field('xd$i')->select(); dump($number);die; } 
for($i=1;$i<8;$i++){ $number= RcxdModel::field('xd'.$i.'')->select(); dump($number);die; } 
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