PHP string函数总结
PHP string函数总结==================================
ceil、floor、round、/、%
floatceil( float$value)向上去整（进一）
cout(1.8)=>2
cout(-1.8)=>2-1
floatfloor( float$value)向下去整(舍去)
floor(1.8)=>1
floor(-1.8)=>-2
round— 对浮点数进行四舍五入
floatround( float$val[, int$precision] )
echo round(1.95583, 2); // 1.96
echo round(1241757, -3); // 1242000
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