Just think it

<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
    echo "Got Irix";
}
if (in_array("mac", $os)) {
    echo "Got mac";
}
?>

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
 
print_r($result);
?>

$subArr=array('0'=>'isTitle','1'=>'isUrl','2'=>'isIntro','3'=>'isAuthor','4'=>'isPub_Date','5'=>'isPub_Time', );
$notSelect = array_diff($subArr,$data); //取数组交集,判断没有选中的对象
foreach($notSelect AS $key=>$val)
    {
      $queryNo[]=$val.'=0';
	}
$queryNo=implode(',',$queryNo);
$queryNo= " UPDATE ......   ";

function array2string($string, $isformdata = 1)
{
	if($string == '') return '';
	if($isformdata) $string = new_stripslashes($string);
	return addslashes(var_export($string, TRUE));
}
 
 
function new_stripslashes($string)
{
	if(!is_array($string)) return stripslashes($string);
	foreach($string as $key => $val) $string[$key] = new_stripslashes($val);
	return $string;
}

function string2array($data)
{
	if($data == '') return array();
	eval("\$array = $data;");
	return $array;
}

< ?php 
$a = array('green', 'red', 'yellow'); 
$b = array('avocado', 'apple', 'banana'); 
$c = array_combine($a, $b); 
 
print_r($c); 
?> 
< ?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);
 
print_r($c);
?>

Array 
( 
[green] => avocado 
[red] => apple 
[yellow] => banana 
) 
Array
(
[green] => avocado
[red] => apple
[yellow] => banana
)

include("config.php");
include("include/jpgraph.php");
include("include/jpgraph_line.php");
//创建背景图像
$resultNum=mysql_query("select * from down_flow ");
//将查询结果设为X坐标和Y坐标显示的数据
$i=0;
while($it=mysql_fetch_array($resultNum)){
	$datay[$i]=(int)$it['flow2'];
	$datax[$i]=(int)$it['hour'];
	$i++;
}
$graph=new Graph(820,490);
//设置刻度样式
$graph->SetScale("intint");
//$graph->SetScale("textint",1000,9500,1,24);
//设置边界范围
$graph->img->SetMargin(40,30,60,10);
//设置标题
$graph->title->Set("统计图");
// 设置中文字体
$graph->title->setFont(FF_SIMSUN,FS_BOLD);
 
 
//定义曲线图
 
$lineplot=new LinePlot($datay,$datax);
//改变曲线图颜色为蓝色
$lineplot->SetColor("blue");
//设置曲线的图例
$lineplot->SetLegend("dataFlow");
$lineplot->setFont(FF_SIMSUN,FS_BOLD);
 
 
 
//将曲线图加入背景图像中
$graph->Add($lineplot);
//将X-Y坐标图输出
$graph->Stroke();
?>

<?php
function bin_sch($array, $low, $high, $k){ 
if ($low <= $high){ 
$mid = intval(($low+$high)/2); 
if ($array[$mid] == $k){ 
return true; 
}elseif ($k < $array[$mid]){ 
return bin_sch($array, $low, $mid-1, $k); 
}else{ 
return bin_sch($array, $mid+1, $high, $k); 
} 
} 
return false; 
} 
$array=array(3,5,1,8,2,10);
$low=min(3,5,1,8,2,10);
$high=max(3,5,1,8,2,10);
sort($array); // 为数组排序
$k=5;
if(bin_sch($array,$low,$high,$k)){
	echo "查找成功";
}else{
	echo "查找失败";
}
?>

<?php  
//截取utf8字符串  
function utf8Substr($str, $from, $len)  
{  
    return preg_replace('#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$from.'}'.  
                       '((?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){0,'.$len.'}).*#s',  
                       '$1',$str);  
}  
?>

<?php   
//截取中文字符串  
function mysubstr($str, $start, $len) {  
    $tmpstr = "";  
    $strlen = $start + $len;  
    for($i = 0; $i < $strlen; $i++) {  
        if(ord(substr($str, $i, 1)) > 0xa0) {  
            $tmpstr .= substr($str, $i, 2);  
            $i++;  
        } else  
            $tmpstr .= substr($str, $i, 1);  
    }  
    return $tmpstr;  
}  
?>

<?php  
/*  
Utf-8、gb2312都支持的汉字截取函数  
cut_str(字符串, 截取长度, 开始长度, 编码);  
编码默认为 utf-8  
开始长度默认为 0  
*/   
 
function cut_str($string, $sublen, $start = 0, $code = 'UTF-8')   
{   
    if($code == 'UTF-8')   
    {   
        $pa = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/";   
        preg_match_all($pa, $string, $t_string);   
 
        if(count($t_string[0]) - $start > $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";   
        return join('', array_slice($t_string[0], $start, $sublen));   
    }   
    else   
    {   
        $start = $start*2;   
        $sublen = $sublen*2;   
        $strlen = strlen($string);   
        $tmpstr = '';   
 
        for($i=0; $i<$strlen; $i++)   
        {   
            if($i>=$start && $i<($start+$sublen))   
            {   
                if(ord(substr($string, $i, 1))>129)   
                {   
                    $tmpstr.= substr($string, $i, 2);   
                }   
                else   
                {   
                    $tmpstr.= substr($string, $i, 1);   
                }   
            }   
            if(ord(substr($string, $i, 1))>129) $i++;   
        }   
        if(strlen($tmpstr)<$strlen ) $tmpstr.= "...";   
        return $tmpstr;   
    }   
}   
 
$str = "abcd需要截取的字符串";   
echo cut_str($str, 8, 0, 'gb2312');   
?>