php实现获取汉字的首字母两个实例

<?php
 /**
* 修复二分法查找方法
* 汉字拼音首字母工具类
*  注： 英文的字串：不变返回(包括数字)    eg .abc123 => abc123
*      中文字符串：返回拼音首字符        eg. 测试字符串 => CSZFC
*      中英混合串: 返回拼音首字符和英文   eg. 我i我j => WIWJ
*  eg.
*  $py = new str2PY();
*  $result = $py->getInitials('啊吧才的饿飞就好i就看了吗你哦平去人是他uv我想一在');
*/
class str2PY
{
    private $_pinyins = array(
        176161 => 'A',
        176197 => 'B',
        178193 => 'C',
        180238 => 'D',
        182234 => 'E',
        183162 => 'F',
        184193 => 'G',
        185254 => 'H',
        187247 => 'J',
        191166 => 'K',
        192172 => 'L',
        194232 => 'M',
        196195 => 'N',
        197182 => 'O',
        197190 => 'P',
        198218 => 'Q',
        200187 => 'R',
        200246 => 'S',
        203250 => 'T',
        205218 => 'W',
        206244 => 'X',
        209185 => 'Y',
        212209 => 'Z',
    );
    private $_charset = null;
    /**
     * 构造函数, 指定需要的编码 default: utf-8
     * 支持utf-8, gb2312
     *
     * @param unknown_type $charset
     */
    public function __construct( $charset = 'utf-8' )
    {
        $this->_charset    = $charset;
    }
    /**
     * 中文字符串 substr
     *
     * @param string $str
     * @param int    $start
     * @param int    $len
     * @return string
     */
    private function _msubstr ($str, $start, $len)
    {
        $start  = $start * 2;
        $len    = $len * 2;
        $strlen = strlen($str);
        $result = '';
        for ( $i = 0; $i < $strlen; $i++ ) {
            if ( $i >= $start && $i < ($start + $len) ) {
                if ( ord(substr($str, $i, 1)) > 129 ) $result .= substr($str, $i, 2);
                else $result .= substr($str, $i, 1);
            }
            if ( ord(substr($str, $i, 1)) > 129 ) $i++;
        }
        return $result;
    }
    /**
     * 字符串切分为数组 (汉字或者一个字符为单位)
     *
     * @param string $str
     * @return array
     */
    private function _cutWord( $str )
    {
        $words = array();
         while ( $str != "" )
         {
            if ( $this->_isAscii($str) ) {/*非中文*/
                $words[] = $str[0];
                $str = substr( $str, strlen($str[0]) );
            }else{
                $word = $this->_msubstr( $str, 0, 1 );
                $words[] = $word;
                $str = substr( $str, strlen($word) );
            }
         }
         return $words;
    }
    /**
     * 判断字符是否是ascii字符
     *
     * @param string $char
     * @return bool
     */
    private function _isAscii( $char )
    {
        return ( ord( substr($char,0,1) ) < 160 );
    }
    /**
     * 判断字符串前3个字符是否是ascii字符
     *
     * @param string $str
     * @return bool
     */
    private function _isAsciis( $str )
    {
        $len = strlen($str) >= 3 ? 3: 2;
        $chars = array();
        for( $i = 1; $i < $len -1; $i++ ){
            $chars[] = $this->_isAscii( $str[$i] ) ? 'yes':'no';
        }
        $result = array_count_values( $chars );
        if ( empty($result['no']) ){
            return true;
        }
        return false;
    }
    /**
     * 获取中文字串的拼音首字符
     *
     * @param string $str
     * @return string
     */
    public function getInitials( $str )
    {
        if ( empty($str) ) return '';
        if ( $this->_isAscii($str[0]) && $this->_isAsciis( $str )){
            return $str;
        }
        $result = array();
        if ( $this->_charset == 'utf-8' ){
            $str = iconv( 'utf-8', 'gb2312', $str );
        }
        $words = $this->_cutWord( $str );
        foreach ( $words as $word )
        {
            if ( $this->_isAscii($word) ) {/*非中文*/
                $result[] = $word;
                continue;
            }
            $code = ord( substr($word,0,1) ) * 1000 + ord( substr($word,1,1) );
            /*获取拼音首字母A--Z*/
            if ( ($i = $this->_search($code)) != -1 ){
                $result[] = $this->_pinyins[$i];
            }
        }
        return strtoupper(implode('',$result));
    }
    private function _getChar( $ascii )
    {
        if ( $ascii >= 48 && $ascii <= 57){
            return chr($ascii);  /*数字*/
        }elseif ( $ascii>=65 && $ascii<=90 ){
            return chr($ascii);   /* A--Z*/
        }elseif ($ascii>=97 && $ascii<=122){
            return chr($ascii-32); /* a--z*/
        }else{
            return '-'; /*其他*/
        }
    }

    /**
     * 查找需要的汉字内码(gb2312) 对应的拼音字符( 二分法 )
     *
     * @param int $code
     * @return int
     */
    private function _search( $code )
    {
        $data = array_keys($this->_pinyins);
        $lower = 0;
        $upper = sizeof($data)-1;
  $middle = (int) round(($lower + $upper) / 2);
        if ( $code < $data[0] ) return -1;
        for (;;) {
            if ( $lower > $upper ){
                return $data[$lower-1];
            }
            $tmp = (int) round(($lower + $upper) / 2);
            if ( !isset($data[$tmp]) ){
    return $data[$middle];
            }else{
    $middle = $tmp;
   }
            if ( $data[$middle] < $code ){
                $lower = (int)$middle + 1;
            }else if ( $data[$middle] == $code ) {
                return $data[$middle];
            }else{
                $upper = (int)$middle - 1;
            }
        }
    }
}
?>

<?php
#冒泡排序法
$arr = array(12,45,89,3,24,55,223,76,22,11,89,2,4,5,28,112,20,434,23,65,65,765,6,8,23,5,33,553,45,423,64,77,84,23);
$tmp;
for($i=0;$i<count($arr)-1;$i++ ){      
    for($j=0;$j<count($arr)-1-$i;$j++){
        if($arr[$j] > $arr[$j+1]){
            $tmp = $arr[$j];
            $arr[$j] = $arr[$j+1];
            $arr[$j+1] = $tmp;
        }
    }
}

print_r($arr);

<?php
   
    //冒泡排序方法     function bubblesort(&$arr){
            //定义一个变量保存交换的值         $temp =0;
        for($i=0;$i<count($arr);$i++){
           
            for($j=0;$j<count($arr)-$i-1;$j++){
                       
                if($arr[$j]>$arr[$j+1]){
                    //如果前面的那个数大于后面的那个数，那么他们就进行交换                     $temp=$arr[$j];
                    $arr[$j]=$arr[$j+1];
                    $arr[$j+1]=$temp;
                }
            }           
        }
    }

    $arr=array(100,99,200,5,-4,6,-7);
    bubbleSort($arr);
    print_r($arr);   //数组是值传递，所以传递的时候加个&符号就是地址传递，改变外部变量
?>

<?php
define('constant','arr1');
$constant = 'arr2';
$variable = 'arr1';
$arr = array(
   'arr1'=>'arr1', 
   'arr2'=>'arr2', 
   'arr3'=>'arr3', 
);
 
echo $arr['arr1'],'<br/>',$arr["$variable"],'<br/>',$arr[constant],'<br/>',$arr[$constant];
 
?>

<?php
include('mpdf.php');
$mpdf=new mPDF('UTF-8','A4','','',15,15,44,15);
$mpdf->useAdobeCJK = true;
$mpdf->SetAutoFont(AUTOFONT_ALL);
$mpdf->SetDisplayMode('fullpage');
//$mpdf->watermark_font = 'GB';
//$mpdf->SetWatermarkText('中国水印',0.1);
$url = 'http://www.你的域名.com/';
$strContent = file_get_contents($url);
//print_r($strContent);die;
$mpdf->showWatermarkText = true;
$mpdf->SetAutoFont();
//$mpdf->SetHTMLHeader( '头部' );
//$mpdf->SetHTMLFooter( '底部' );
$mpdf->WriteHTML($strContent);
$mpdf->Output('ss.pdf');
//$mpdf->Output('tmp.pdf',true);
//$mpdf->Output('tmp.pdf','d');
//$mpdf->Output();
exit;
?>

<?php
$fruits = array("lemon", "orange", "banana", "apple");
sort($fruits);
var_dump($fruits);
?>
结果：
array

0 =>

string

 'apple' (length=5)
  1 =>

string

 'banana' (length=6)
  2 =>

string

 'lemon' (length=5)
  3 =>

string

 'orange' (length=6)

<?php
$fruits = array("lemon", "orange", "banana", "apple");
rsort($fruits);
var_dump($fruits);
?>
结果：
array
  0 =>

string

 'orange' (length=6)
  1 =>

string

 'lemon' (length=5)
  2 =>

string

 'banana' (length=6)
  3 =>

string

 'apple' (length=5)

<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
asort($fruits);
var_dump($fruits);
?>
结果：
array
  'c' =>

string

 'apple' (length=5)
  'b' =>

string

 'banana' (length=6)
  'd' =>

string

 'lemon' (length=5)
  'a' =>

string

 'orange' (length=6)

<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
var_dump($fruits);
?>
结果
array
  'a' =>

string

 'orange' (length=6)
  'd' =>

string

 'lemon' (length=5)
  'b' =>

string

 'banana' (length=6)
  'c' =>

string

 'apple' (length=5)

<?php

$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
var_dump($fruits);
?>
结果
array

'a' =>

string

 'orange' (length=6)
  'b' =>

string

 'banana' (length=6)
  'c' =>

string

 'apple' (length=5)
  'd' =>

string

 'lemon' (length=5)

<?php
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
krsort($fruits);
var_dump($fruits);
?>

array
  'd' =>

string

 'lemon' (length=5)
  'c' =>

string

 'apple' (length=5)
  'b' =>

string

 'banana' (length=6)
  'a' =>

string

 'orange' (length=6)

<?php
function cmp($a, $b)
{
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? -1 : 1;
}

$a = array(3, 2, 5, 6, 1);

usort($a, "cmp");

var_dump($a);
?>
结果：
array
  0 =>

int

 1
  1 =>

int

 2
  2 =>

int

 3
  3 =>

int

 5
  4 =>

int

 6

<?php
function cmp($a, $b)
{
    $a = preg_replace('@^(a|an|the) @', '', $a);
    $b = preg_replace('@^(a|an|the) @', '', $b);
    return strcasecmp($a, $b);
}

$a = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);

uksort($a, "cmp");

var_dump($a);
?>
结果：
array
  'an apple' =>

int

 3
  'a banana' =>

int

 4
  'the Earth' =>

int

 2
  'John' =>

int

 1

<?php
// Comparison function
function cmp($a, $b) {
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? -1 : 1;
}

// Array to be sorted
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
var_dump($array);

// Sort and print the resulting array
uasort($array, 'cmp');
var_dump($array);
?>
结果：
array
  'a' =>

int

 4
  'b' =>

int

 8
  'c' =>

int

 -1
  'd' =>

int

 -9
  'e' =>

int

 2
  'f' =>

int

 5
  'g' =>

int

 3
  'h' =>

int

 -4
array
  'd' =>

int

 -9
  'h' =>

int

 -4
  'c' =>

int

 -1
  'e' =>

int

 2
  'g' =>

int

 3
  'a' =>

int

 4
  'f' =>

int

 5
  'b' =>

int

 8

<?php
$ar = array(
       array("10", 11, 100, 100, "a"),
       array(   1,  2, "2",   3,   1)
      );
  
array_multisort($ar[0], SORT_ASC, SORT_STRING,
                $ar[1], SORT_NUMERIC, SORT_DESC);
var_dump($ar);
?>
结果：
array
  0 =>
    array
      0 =>

string

 '10' (length=2)
      1 =>

int

 100
      2 =>

int

 100
      3 =>

int

 11
      4 =>

string

 'a' (length=1)
  1 =>
    array
      0 =>

int

 1
      1 =>

int

 3
      2 =>

string

 '2' (length=1)
      3 =>

int

 2
      4 =>

int

1

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];
 }
 return $new_array;
}