php 英尺、英里、英寸转换的实现方法

PHP英尺,英里,和英寸转换器，感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：

/**
 * 英尺,英寸转换
 *
 * @param 
 * @arrange (编程之家) jb51.cc
 **/
function distance($curlen,$type,$totype,$on){ 
    //Check to see if the first value is an interger 
    if(!is_int($curlen)){ 
        return 'Wrong input type for first value'; 
        exit; 
    } 
    //Make sure second value is either f,i,or m 
    if($type!=f&&$type!=i&&$type!=m){ 
        return 'Wrong input type for second value'; 
        exit; 
    } 
    //Make sure third value is either f,or m 
    if($totype!=f&&$totype!=i&&$totype!=m){ 
        return 'Wrong input type for third value'; 
        exit; 
    } 
    //Make sure fourth value is either 1 or 2 
    if($on!=1&&$on!=2){ 
        return 'Wrong input type for fourth value'; 
        exit; 
    } 
    //If it passes the above,get the current type 
    switch($type){ 
        //if it is an i do the math 
        case i: 
            if($totype==f){ 
                $len = $curlen / 12; 
                if($on==1){ 
                    return number_format(round($len,1)).' FT'; 
                }else{ 
                    return number_format(round($len,1)); 
                } 
            }elseif($totype==m){ 
                $len = $curlen / 63360; 
                if($on==1){ 
                    return number_format(round($len,1)).' MI'; 
                }else{ 
                    return number_format(round($len,1)); 
                } 
            } 
        break; 
        //if it is an f do the math 
        case f: 
            if($totype==i){ 
                $len = $curlen * 12; 
                if($on==1){ 
                    return number_format(round($len,1)).' IN'; 
                }else{ 
                    return number_format(round($len,1)); 
                } 
            }elseif($totype==m){ 
                $len = $curlen / 5280; 
                if($on==1){ 
                    return number_format(round($len,1)); 
                } 
            } 
        break; 
        //if it is an m do the math 
        case m: 
            if($totype==i){ 
                $len = $curlen * 63360; 
                if($on==1){ 
                    return number_format(round($len,1)); 
                } 
            }elseif($totype==f){ 
                $len = $curlen * 5280; 
                if($on==1){ 
                    return number_format(round($len,1)); 
                } 
            } 
        break; 
    } 
}
//position 1 = distance numaric numbers only no commas 
//position 2 = current lenght type of position 1 
//position 3 = convert lenght type of position 1 and 2 
//position 4 = FT,MI,IN extentions on or off :: 1=on : 2=off 
//m = miles 
//f = feet 
//i = inches 
echo distance(123,m,f,1); 


/***   来自编程之家 jb51.cc（jb51.cc）   ***/