php中常用函數(shù)

1、PHP中常用函數(shù)數(shù)學(xué)函數(shù)3.2進(jìn)一取整intceil(floatnumber)【ceilling】：天花板e(cuò)choceil(9.99)echo10舍去法取整intflo(floatnumber)echoflo(9.99)echo9浮點(diǎn)數(shù)取余floatfmod(floatxfloaty)$x=4.3$y=2.1$r=fmod($x$y)echo$recho0.1返回?cái)?shù)的N次方numberpow(numberbasenumberexp)ec

2、hopow(213)echo8192浮點(diǎn)數(shù)四舍五入floatround(floatval[inrprecision])echoround(1.324453)echo1.324求平方根floatsqrt(floatarg)【square】：正方形的，平方【root】：根，根源，祖先。echosqrt(4)echo2求最大值mixedmax(numberarg1numberarg2)mixedmax(arraynumbers[array..

3、.])echomax(12345)echoM_PI3.14159265359M_PI是常量產(chǎn)生的值與pi()一樣echo任意進(jìn)制之間的轉(zhuǎn)換stringbase_convert(string$numberint$frombaseint$tobase)$hexadecimal=A23421echobase_convert($hexadecimal162)echo101000100011010000100001計(jì)算指數(shù)floatexp(flo

4、at$arg)echoexp(0)echo1字符串函數(shù)echotrim($text“t“)“Theseareafewwds:)...“echortrim()刪除字符串右邊的空格或其他預(yù)定義字符其別名是chop$str=“HelloWld!nn“echortrim($str)“HelloWld!“echoechortrim($str“n“)“HelloWld!“echoltrim()刪除字符串左邊的空格或其他預(yù)定義字符$str=“nnHe