PHP string函数总结

PHP string函数总结

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ceil、floor、round、/、%

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float ceil ( float $value )向上去整（进一） ??? cout(1.8)=>2
??? cout(-1.8)=>2-1
float floor ( 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

float round ( float $val [, int $precision ] )
??? echo?round(1.95583,?2);??//?1.96
??? echo?round(1241757,?-3);?//?1242000=================================