php数组转换
<br />如下数组：<br />$test = array(<br /> 1 => '1_5000',<br /> 2 => '1_10000',<br /> 3 => '1_7000',<br /> 4 => '1_6500',<br /> 5 => '1_5500',<br /> 6 => '1_10500',<br /> 7 => '0_0',<br /> 8 => '1_9000',<br /> 9 => '1_7000',<br /> 10 => '1_11000',<br /> 11 => '1_5000',<br />12 => '0_0'<br />);<br />
我需要对它的value进行拆分，然后按'_'后面的值由高到低排序，中间为0的值顺序不能变化，求解
------解决思路----------------------
usort 的第二个函数是回调函数名（字符串）
你需要确保这个函数是已定义的
如果你使用类的方法作为回调函数，那么应该写作 array($this, '方法名')
这个用法几乎没有文字资料（包括手册）做过说明，但散见于一些代码中
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