PHP图片上传与重命名六种方法总结

const KeyCode = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_$'; 
 
    /**
     * 将64进制的数字字符串转为10进制的数字字符串
     * @param $m string 64进制的数字字符串
     * @param $len integer 返回字符串长度，如果长度不够用0填充，0为不填充
     * @return string
     */ 
    function hex64to10($m, $len = 0) { 
        $m = (string)$m; 
        $hex2 = ''; 
        $Code = KeyCode; 
        for($i = 0, $l = strlen($Code); $i < $l; $i++) { 
            $KeyCode[] = $Code[$i]; 
        } 
        $KeyCode = array_flip($KeyCode); 
 
        for($i = 0, $l = strlen($m); $i < $l; $i++) { 
            $one = $m[$i]; 
            $hex2 .= str_pad(decbin($KeyCode[$one]), 6, '0', STR_PAD_LEFT); 
        } 
        $return = bindec($hex2); 
 
        if($len) { 
            $clen = strlen($return); 
            if($clen >= $len) { 
                return $return; 
            } 
            else { 
                return str_pad($return, $len, '0', STR_PAD_LEFT); 
            } 
        } 
        return $return; 
    } 
 
    /**
     * 将10进制的数字字符串转为64进制的数字字符串
     * @param $m string 10进制的数字字符串
     * @param $len integer 返回字符串长度，如果长度不够用0填充，0为不填充
     * @return string
     */ 
    function hex10to64($m, $len = 0) { 
        $KeyCode = KeyCode; 
        $hex2 = decbin($m); 
        $hex2 = str_rsplit($hex2, 6); 
        $hex64 = array(); 
        foreach($hex2 as $one) { 
            $t = bindec($one); 
            $hex64[] = $KeyCode[$t]; 
        } 
        $return = preg_replace('/^0*/', '', implode('', $hex64)); 
        if($len) { 
            $clen = strlen($return); 
            if($clen >= $len) { 
                return $return; 
            } 
            else { 
                return str_pad($return, $len, '0', STR_PAD_LEFT); 
            } 
        } 
        return $return; 
    } 
 
    /**
     * 将16进制的数字字符串转为64进制的数字字符串
     * @param $m string 16进制的数字字符串
     * @param $len integer 返回字符串长度，如果长度不够用0填充，0为不填充
     * @return string
     */ 
    function hex16to64($m, $len = 0) { 
        $KeyCode = KeyCode; 
        $hex2 = array(); 
        for($i = 0, $j = strlen($m); $i < $j; ++$i) { 
            $hex2[] = str_pad(base_convert($m[$i], 16, 2), 4, '0', STR_PAD_LEFT); 
        } 
        $hex2 = implode('', $hex2); 
        $hex2 = str_rsplit($hex2, 6); 
        foreach($hex2 as $one) { 
            $hex64[] = $KeyCode[bindec($one)]; 
        } 
        $return = preg_replace('/^0*/', '', implode('', $hex64)); 
        if($len) { 
            $clen = strlen($return); 
            if($clen >= $len) { 
                return $return; 
            } 
            else { 
                return str_pad($return, $len, '0', STR_PAD_LEFT); 
            } 
        } 
        return $return; 
    } 
 
    /**
     * 功能和PHP原生函数str_split接近，只是从尾部开始计数切割
     * @param $str string 需要切割的字符串
     * @param $len integer 每段字符串的长度
     * @return array
     */ 
    function str_rsplit($str, $len = 1) { 
        if($str == null || $str == false || $str == '') return false; 
        $strlen = strlen($str); 
        if($strlen <= $len) return array($str); 
        $headlen = $strlen % $len; 
        if($headlen == 0) { 
            return str_split($str, $len); 
        } 
        $return = array(substr($str, 0, $headlen)); 
        return array_merge($return, str_split(substr($str, $headlen), $len)); 
    } 
 
$a=idate("U"); 
echo "rn<br />e:" . hex10to64($a); 
echo "rn<br />e:" . hex64to10(hex10to64($a)); 

function dec2s4($dec) {   
    $base = '0123456789_$abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';   
    $result = '';   
 
    do {   
        $result = $base[$dec % 64] . $result;   
        $dec = intval($dec / 64);   
    } while ($dec != 0);   
 
    return $result;   
}   
 
function  s42dec($sixty_four) {   
    $base_map = array ( '0' => 0,'1' => 1,'2' => 2,'3' => 3,'4' => 4,'5' => 5,'6' => 6,'7' => 7,'8' => 8,'9' => 9,'_' => 10,'$' => 11,'a' => 12,'b' => 13,'c' => 14,'d' => 15,'e' => 16,'f' => 17,'g' => 18,'h' => 19,'i' => 20,'j' => 21,'k' => 22,'l' => 23,'m' => 24,'n' => 25,'o' => 26,'p' => 27,'q' => 28,'r' => 29,'s' => 30,'t' => 31,'u' => 32,'v' => 33,'w' => 34,'x' => 35,'y' => 36,'z' => 37,'A' => 38,'B' => 39,'C' => 40,'D' => 41,'E' => 42,'F' => 43,'G' => 44,'H' => 45,'I' => 46,'J' => 47,'K' => 48,'L' => 49,'M' => 50,'N' => 51,'O' => 52,'P' => 53,'Q' => 54,'R' => 55,'S' => 56,'T' => 57,'U' => 58,'V' => 59,'W' => 60,'X' => 61,'Y' => 62,'Z' => 63);     $result = 0;   
    $len = strlen($sixty_four);   
 
    for ($n = 0; $n < $len; $n++) {   
        $result *= 64;   
        $result += $base_map[$sixty_four{$n}];   
    }   
 
    return $result;   
}   
 
$a=idate("U"); 
var_dump(dec2s4($a));   
var_dump(s42dec(dec2s4($a))); 

$strarr = array(); 
$time1 = microtime(true); 
for($i = 0; $i < 10000; ++$i) { 
     $str = idate("U")+$i; 
     $strarr[] = "{$i}->$strrn<br>"; 
 } 
 $time2 = microtime(true); 
 $time3 = $time2 - $time1; 
 
 $time1 = microtime(true); 
 for($i = 0; $i < 10000; ++$i) { 
     $str = dec2s4(idate("U")+$i); 
    $strarr[] = "{$i}->$strrn<br>"; 
} 
$time2 = microtime(true); 
echo "rn<br />运行10000次用时（秒）：" . ($time2 - $time1 - $time3);