php常用函数集锦[备份用的]

1、判断是否正确的日期格式

/**
     * 是否正确的日期
     *
     * @access  public
     */
    private function _isdate($str,$format="Y-m-d H:i")
    {
        $strArr = explode("-",$str);
        if(empty($strArr))
        {
            return false;
        }
        foreach($strArr as $val)
        {
            if(strlen($val)<2)
            {
                $val="0".$val;
            }
            $newArr[]=$val;
        }
        $str =implode("-",$newArr); 
        $unixTime=strtotime($str); 
        $checkDate= date($format,$unixTime); 
        if($checkDate==$str)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

 2、汉字转整型数字，如：三百八十六 转成 386（from: http://blog.csdn.net/sui13725202/article/details/11581989）

test();

/**
 * 测试
 */
function test() {
    echo CnToInt('一'); // 1
    echo CnToInt('十'); // 10
    echo CnToInt('十一'); // 11
    echo CnToInt('一百一十'); // 110
    echo CnToInt('一千零一'); // 1001
    echo CnToInt('一万零一百零一'); // 10101
    echo CnToInt('一亿一千三百万零三千零一'); // 113003001
    echo CnToInt('一千万亿'); // 11.0E+15
}

/**
 * 中文转数字
 * @param String $var 需要解析的中文数
 * @param Int $start 初始值
 * @return int
 */
function CnToInt($var, $start = 0) {
    if (is_numeric($var)) {
        return $var;
    }
    if (intval($var) === 0) {
        $splits = array('亿' => 100000000, '万' => 10000);
        $chars = array('万' => 10000, '千' => 1000, '百' => 100, '十' => 10, '一' => 1, '零' => 0);
        $Ints = array('零' => 0, '一' => 1, '二' => 2, '三' => 3, '四' => 4, '五' => 5, '六' => 6, '七' => 7, '八' => 8, '九' => 9, '十' => 10);
        $var = str_replace('零', "", $var);
        foreach ($splits as $key => $step) {
            if (strpos($var, $key)) {
                $strs = explode($key, $var);
                $start += CnToInt(array_shift($strs)) * $step;
                $var = join('', $strs);
            }
        }
        foreach ($chars as $key => $step) {
            if (strpos($var, $key) !== FALSE) {
                $vs = explode($key, $var);
                if ($vs[0] === "") {
                    $vs[0] = '一';
                }
                $start += $Ints[array_shift($vs)] * $step;
                $var = join('', $vs);
            } elseif (mb_strlen($var, 'utf-8') === 1) {
                $start += $Ints[$var];
                $var = '';
                break;
            }
        }
        return $start;
    } else {
        return intval($var);
    }
}

 3、生成唯一的值：uniqid

 4、中文截取：

function self_substr($str, $len = 12, $dot = true)
    {
        $i = 0;
        $l = 0;
        $c = 0;
        $a = array();
        while ($l < $len)
        {
            $t = substr($str, $i, 1);
            if (ord($t) >= 224)
            {
                $c = 3;
                $t = substr($str, $i, $c);
                $l += 2;
            }
            elseif (ord($t) >= 192)
            {
                $c = 2;
                $t = substr($str, $i, $c);
                $l += 2;
            }
            else
            {
                $c = 1;
                $l++;
            }
            // $t = substr($str, $i, $c);
            $i += $c;
            if ($l > $len) break;
            $a[] = $t;
        }
        $re = implode('', $a);
        if (substr($str, $i, 1) !== false)
        {
            array_pop($a);
            ($c == 1) and array_pop($a);
            $re = implode('', $a);
            $dot and $re .= '...';
        }
        return $re;
    }

 5、二维数组的排序

function array_sort($arr,$keys,$type='asc')
    {
        $keysvalue = $new_array = array();
        foreach ($arr as $k=>$v) {
            $keysvalue[$k] = $v[$keys];
        }
        if($type == 'asc') {
            asort($keysvalue);
        } else {
            arsort($keysvalue);
        }
        reset($keysvalue);
        foreach($keysvalue as $k=>$v) {
            $new_array[$k] = $arr[$k];
        }
        
        $arr = array();
        foreach($new_array as $key => $val) {
            $arr[] = $val;
        }
        return $arr; 
    }