<?php
$arr1=array(2,5,7,9,12);
$arr2=array(3,4,6,8,10,11);
function merge_sort($arr1,$arr2){$len1=count($arr1);$len2=count($arr2);$arr=array();$i=$j=0;while($i<$len1&&$j<$len2){if($arr1[$i]<=$arr2[$j]){$arr[]=$arr1[$i++];}else{$arr[]=$arr2[$j++];}}while($i<$len1)$arr[]=$arr1[$i++];while($j<$len2)$arr[]=$arr2[$j++];return $arr;
}print_r(merge_sort($arr1,$arr2));

function tento26($num){$str='';$chu=floor($num/26);$yu=$num%26;$str.="{".$yu."}";if($chu>26){$str.=tento26($chu);}else{$str.="{".$chu."}";}return $str;
}function numtoalph($match){$alp=' abcdefghijklmnopqrstuvwxyz';if($match[1]>=26){return false;}return $alp[$match[1]];
}
$str= tento26(300);$str1=strrev(preg_replace_callback('#\{(\d+)\}#','numtoalph',$str));
echo $str1;

<?php
function myjson_encode($arr){$jsonstr='{';foreach($arr as $k=>$v){if(is_array($v)){$jsonstr.='"'.$k.'":'.myjson_encode($v).',';}else{$jsonstr.='"'.$k.'":"'.$v.'",';}}$jsonstr=trim($jsonstr,',');$jsonstr.='}';return $jsonstr;
}

<?php#二分查找function binarySearch(Array $arr, $target) {$low = 0;$high = count($arr) - 1;while($low <= $high) {$mid = floor(($low + $high) / 2);#找到元素if($arr[$mid] == $target) return $mid;#中元素比目标大,查找左部if($arr[$mid] > $target) $high = $mid - 1;#重元素比目标小,查找右部if($arr[$mid] < $target) $low = $mid + 1;}#查找失败return false;}$arr = array(1, 3, 5, 7, 9, 11);$inx = binarySearch($arr, 1);var_dump($inx);
?>

<?php
error_reporting(0);
function cny($ns) {static $cnums=array("零","壹","贰","叁","肆","伍","陆","柒","捌","玖"), $cnyunits=array("圆","角","分"), $grees=array("拾","佰","仟","万","拾","佰","仟","亿"); list($ns1,$ns2)=explode(".",$ns,2);$ns2=array_filter(array($ns2[1],$ns2[0]));$ret=array_merge($ns2,array(implode("",_cny_map_unit(str_split($ns1),$grees)),"")); $ret=implode("",array_reverse(_cny_map_unit($ret,$cnyunits))); echo $ret;echo "<br>";return str_replace(array_keys($cnums),$cnums,$ret);
}
function _cny_map_unit($list,$units) { $ul=count($units); $xs=array(); foreach (array_reverse($list) as $x) { $l=count($xs); if ($x!="0" || !($l%4)){$n=($x=='0'?'':$x).($units[($l-1)%$ul]);} else{$n=is_numeric($xs[0][0])?$x:''; }array_unshift($xs,$n);} return $xs;
}echo cny(2305.32);

<?php
function ysf($arr,$current=0,$out=3){$count=count($arr);$num=1;if($count==1){echo $arr[0];}else{while($num++<$out){$current++;$current=$current%$count;}echo $arr[$current]."<br>";array_splice($arr,$current,1);ysf($arr,$current,$out);}}
$arr=[1,2,3,4,5,6,7,8,9,10];
ysf($arr,0,4);