thinkphp字符相关操作

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【前言】

   本文总结下tp中字符相关操作

 

【主体】

（1）限制输出显示的长度，截取显示前几个字符

        这里显示0到10个字符，###表示本身

{$vol.content|msubstr=###,0,10}

   例如：数据库中的字符过长时，会限制输出10个。后面为...

（2）去除前几个字符

        php 在不知道字符串有多长的情况下，如何去除前三个字符？

$string='字符串';
$subject=substr_replace(string,'',0,3);

 

 

 

 

 

 

【总结】

最后附上修改封装后的截取字符串、去除空格等操作的函数

 

放到Common/Common/function.php下

$length)
    {
        if(function_exists("mb_substr")){
            if($suffix)
                return mb_substr($str, $start, $length, $charset)."...";
            else
                return mb_substr($str, $start, $length, $charset);
        }elseif(function_exists('iconv_substr')) {
            if($suffix)
                return iconv_substr($str,$start,$length,$charset)."...";
            else
                return iconv_substr($str,$start,$length,$charset);
        }
        $re['utf-8'] = "/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
        $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
        $re['gbk'] = "/[x01-x7f]|[x81-xfe][x40-xfe]/";
        $re['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
        preg_match_all($re[$charset], $str, $match);
        $slice = join("",array_slice($match[0], $start, $length));
        if($suffix) return $slice."…";
        return $slice;
    }
    else
    {
        return $str;
    }
}

/**
 * GET 请求
 * 需要curl扩展支持
 */
function http_get($url){
    $oCurl = curl_init();
    if(stripos($url,"https://")!==FALSE){
        curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($oCurl, CURLOPT_SSLVERSION, 1);
    }
    curl_setopt($oCurl, CURLOPT_URL, $url);
    curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
    $sContent = curl_exec($oCurl);
    $aStatus = curl_getinfo($oCurl);
    curl_close($oCurl);
    if(intval($aStatus["http_code"])==200){
        return $sContent;
    }else{
        return false;
    }
}

/**
 * POST 请求
 * 需要curl扩展支持
 */
function http_post($url,$param,$post_file=false){
    $oCurl = curl_init();
    if(stripos($url,"https://") !== FALSE){
        curl_setopt($oCurl,CURLOPT_SSL_VERIFYPEER,FALSE);
        curl_setopt($oCurl,CURLOPT_SSL_VERIFYHOST,false);
        curl_setopt($oCurl,CURLOPT_SSLVERSION,1);
    }
    if (is_string($param) || $post_file){
        $strPOST = $param;
    } else {
        $aPOST = array();
        foreach($param as $key => $val){
            $aPOST[] = $key."=" . urlencode($val);
        }
        $strPOST = join("&",$aPOST);
    }
    curl_setopt($oCurl,CURLOPT_URL,$url);
    curl_setopt($oCurl,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($oCurl,CURLOPT_POST,true);
    curl_setopt($oCurl,CURLOPT_POSTFIELDS,$strPOST);
    $sContent = curl_exec($oCurl);
    $aStatus = curl_getinfo($oCurl);
    curl_close($oCurl);
    if(intval($aStatus["http_code"]) == 200){
        return $sContent;
    }else{
        return false;
    }
}

/**
 * 空格换行符过滤
 */
function trimAll($parma){
    if(is_array($parma)){
        return array_map('trimAll',$parma);
    }
    $before = array(" ","   ","\t","\r","\n");
    $after = array('','','','','');
    return str_replace($before,$after,$parma);
}

// 评论显示替换表情标签
function reFace($str){
    for($i=1;$i<76;$i++){
        $str = str_replace("[em_$i]","",$str);
    }
    return $str;
}

 

 

 

 

 

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