PHP string函数小结

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

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