Owner, don’t listen to other people’s nonsense. Every time there are people who don’t know how to pretend to understand,
If substr is used and the number happens to be in Chinese, garbled characters will appear
Because numbers and letters count as 1 byte, and Chinese counts as 2 bytes,
substr is not cut by numbers but by bytes
you can use it
echo mb_substr('I am very happy today', 0, 5, 'utf-8');
echo mb_strcut ('I am very happy today', 0,5, 'utf-8');
The first one is output by number,
The second one is output by bytes,
The most important thing is that there will be no garbled characters
If your page is gb2312, you can change the utf-8 on the back yourself
But the first few words you want to extract from your article, if it is edited with an editor
may contain HTML, which needs to be processed separately.
Reference materials, my own space:
$link=mysql_connect("localhost","","");
MySQL_query("SET NAMES 'gbk'");
$sql = "select * from books";
$result = mysql_query($sql, $link); //Execute query statement
while ($bookInfo = mysql_fetch_array($result)){ //Return the query results to the array
$name = $bookInfo["name"]; //Remove data from the array
$price = $bookInfo["price"];
$isbn = $bookInfo["ISBN"];
echo "
}
mysql_free_result($result);
mysql_close($link);
?>
Do you understand? Use while to output all data.
Use PHP to determine whether the query array is empty. If it is not empty, it will assign a value to the html and control whether to display the image.
$sql = "select * from '_goods_attr' where 'attr_value'=' '"; PHP query, $res=mysql_query($sql); PHP processing, $arr = mysql_fetch_assoc($res); Convert to array, The next step is to determine whether the array is empty and assign values to the html template.
$selv=array(1,2,3,4,5); //Drop-down list value
$dbv=3;
foreach($selv as $s){
$issl='';
if($s==$dbv) $issl='selected';
$str.="";
}
echo '';
?>
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