php中strpos函数判断字符存在误区

    /*
    * @Author： vfhky 2013年09月21日22:13
    * @Variable string $word: 黑名单中的关键词，用户可自行按规律进行增加或减少
    * @Variable string $comment_author: 用户提交的$_POST['author']字段值，表示昵称
    * @Variable string $comment_content: 用户提交的$_POST['comment']字段值，表示评论内容
    **/
    $words = "com,cn,info,net,www,http,cc,host,代理,移动,电,国,港,器,服,医,肥,药,农,信,贷,日,盈,网,票,域,销,黄,司,企,机,租,人,钱,设,购,播";
    $word = explode(',', $words);
    $num = count($word);
    for($i=0;$i< $num ;$i++){
    if (strpos($comment_author,$word[$i],0) || strpos($comment_content,$word[$i],0)){
    err( __('广告必删，多谢理解!') );
    break;
    }
    }

    /*
    * @Author： vfhky 2013年09月24日20:06
    * @Description: 正确使用strpos函数，解决上一篇文章代码的BUG
   
    **/
    $words = "com,cn,info,net,www,http,cc,host,代理,移动,电,国,港,器,服,医,肥,药,农,信,贷,日,购,播";
    $word = explode(',', $words);
    $num = count($word);
    for($i=0;$i< $num ;$i++){
    if ( (strpos($comment_author,$word[$i],0) !== false) || (strpos($comment_content,$word[$i],0) !== false) ){
    err( __('广告必删，多谢理解!') );
    break;
    }
    }

    $words = array("com","cn","info","net","www","http","cc","host","代理","移动","电","国","港","购");
    $num = count($words);
    for($i=0;$i< $num ;$i++){
    if (strpos($comment_author,$words[$i],0) !== false || strpos($comment_content,$words[$i],0) !== false){
    err( __('广告必删，多谢理解!') );
    break;
    }
    }

function getmicrotime() 
{ 
    list($usec, $sec) = explode(" ",microtime()); 
    return ((float)$usec + (float)$sec); 
}

<?php
/**
* Simple function to replicate PHP 5 behaviour
*/
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}

$time_start = microtime_float();

// Sleep for a while
usleep(100);

$time_end = microtime_float();
$time = $time_end - $time_start;

echo "Did nothing in $time secondsn";
?>

ob_start();

........

if ( something ){

ob_end_clean();

header("Location: yourlocation")；

exit;

else{

..........

ob_flush(); //可省略

ob_start();
var_dump($var);
$out = ob_get_contents();
ob_end_clean();

str_replace(' ','',$abc).

<?php

trim 去除一个字符串两端空格，
rtrim 是去除一个字符串右部空格，
ltrim 是去除一个字符串左部空格。

echo trim(" 空格www.111cn.net ")."<br>";
echo rtrim(" 空格 ")."<br>";
echo ltrim(" 空格 ")."<br>";
?>

<?php
$str = 'con[1]=28&selt[1]=1&con[2]=29&selt[2]=4&con[3]=26&selt[3]=4&con[4]=30&selt[4]=2&con[5]=4&selt[5]=1&con[6]=11&con[7]=12';
$arr = explode('&',$str);
$arr2 = array();
foreach($arr as $k=>$v){
        $arr = explode('=',$v);
        $arr2[$k] = $arr[1];
}
print_r($arr2);
?>
//输出
Array
(
    [0] => 28
    [1] => 1
    [2] => 29
    [3] => 4
    [4] => 26
    [5] => 4
    [6] => 30
    [7] => 2
    [8] => 4
    [9] => 1
    [10] => 11
    [11] => 12
)
//第二个
<?php
$str = 'con[1]=28&selt[1]=1&con[2]=29&selt[2]=4&con[3]=26&selt[3]=4&con[4]=30&selt[4]=2&con[5]=4&selt[5]=1&con[6]=11&con[7]=12';
$arr = explode('&',$str);
$arr2 = array();
foreach($arr as $k=>$v){
        $arr = explode('=',$v);
        $arr2[$arr[0]] = $arr[1];
}
print_r($arr2);
?>
//输出
Array
(
    [con[1]] => 28
    [selt[1]] => 1
    [con[2]] => 29
    [selt[2]] => 4
    [con[3]] => 26
    [selt[3]] => 4
    [con[4]] => 30
    [selt[4]] => 2
    [con[5]] => 4
    [selt[5]] => 1
    [con[6]] => 11
    [con[7]] => 12
)

//将多维数组中所有的数值转换成字符串????》最多支持三维数组
function implodex( $glue, $array, $separator='' ) {
if ( ! is_array( $array ) ) return $array;
$string = array();

$count = 0;
foreach ( $array as $key => $val ) {
if ( is_array( $val ) )
$val = implode( $glue, $val );

if($count == 0){
$string[] = "{$val}";
}else{
$string[] = "{$glue}{$val}";
}
}

if(empty($separator))$separator = $glue;

return implode( $separator, $string );
}

<?php
// $Id: test3.php,v 1.0 2011-6-7  goba Exp $
 
/**
 * 测试PHP存储数值
 *
 * @author Lok
 */
 
 
$config = array (
 'host' => 'localhost',
 'user_name' => 'root',
 'password' => '',
 'db_name' => 'ecshop',
 'charset' => 'utf8',
 'remark' => array ('note' => '要注意密码的安全', 'author' => 'Lok')
);
 
 
$str = serialize($config);
$arr = unserialize($str);
 
echo '--------str--------<br />';
var_dump($str);
echo '<br />-------arr----------<br />';
var_dump($arr)
?>结果：

--------str--------
string(221) "a:6:{s:4:"host";s:9:"localhost";
   s:9:"user_name";s:4:"root";
   s:8:"password";s:0:"";
   s:7:"db_name";s:8:"ecshop";
   s:7:"charset";s:4:"utf8";
   s:6:"remark";a:2:{s:4:"note";s:24:"要注意密码的安全";
                s:6:"author";s:3:"Lok";}}"
-------arr----------
array(6) { ["host"]=> string(9) "localhost"
        ["user_name"]=> string(4) "root"
        ["password"]=> string(0) ""
        ["db_name"]=> string(8) "emoishop"
               ["charset"]=> string(4) "utf8"
               ["remark"]=> array(2) { ["note"]=> string(24) "要注意密码的安全"
             ["author"]=> string(3) "Lok" } }