ThinkPhp limit output text length

【Foreword】

      Requirement: Display in the foreground that you don't want to output all characters and output about 20 characters

      It is best not to use substr directly, this function does not support Chinese very well. After some searching, I found a good one, record it here

Put this file directly into Application\Common\Common\function.php under the application-level public function library, if it is not created, it can be imported automatically

 

【Case】

<span>{$vol.des|msubstr=###,0,10}</span>

 

【main body】

<?php
/**
 * @desc thinkphp custom function library...
 *
 */
// 1. msubstr string interception;
// 2. Send a get request through curl ---- these two requests support the HTTP protocol and also support the https protocol
// 3. Send post request via curl---
// 4. Remove spaces

/**  
 *String interception function
 * Enable mbstring extension
 */
function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){
    if(mb_strlen($str,$charset)>$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 request
 * requires curl extension support
 */
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 request
 * requires curl extension support
 */
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;
    }
}

/**
 * whitespace newline filter
 */
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);
}

 

 

 

 

 

 

 

.