我有一个html菜单，最大宽度为990px。现在我想从数组中打印这个菜单，并使这些菜单列表(<li>)在一行中。删除填充空间或每个菜单列表，为一个保守的计算，如何限制总字数在200个字符以内从一个foreach?我没有好主意，在我的代码中，将数组分组成字符串然后切割字符串长度，这不是一个好主意。
$a = array("item1","item2","item3" ... "item30");//'item' would be change to any other words.
foreach($a as $b){
$c.=$b.'|';
}
function limitString($string, $limit = 200) {
if(strlen($string) < $limit) {return $string;}
$regex = "/(.{1,$limit})'b/";
preg_match($regex, $string, $matches);
return $matches[1];
}
$d = explode('|',limitString($c));
foreach($d as $e){
echo '<li><a href="">'.$e.'</li>';
}
以item20中的第200个字符为例，在item19中需要将其打破，则在此输出19个菜单列表
您可以像其他评论所说的那样使用substr()。要保存单词分割，请查看此线程。
无论如何，有一个更好的方法来处理字符串的物理长度，但它涉及到JavaScript。
所有你要做的是创建不可见的div包含字符串你想测量，然后得到它的宽度和高度。你为什么要这么做?当然，因为每个字母有不同的宽度，而且不同的浏览器在不同的操作系统上以不同的方式显示字体。
尝试如下:
$array = array("item1","item2","item3", "item4", "item5", "item6", "item7", "item8", "item9", "item10", "item11", "item12", "item13", "item14", "item15", "item16", "item17", "item18", "item19", "item20", "item21", "item22", "item23", "item24", "item25", "item26", "item27", "item28", "item29", "item30", "item31", "item32", "item33", "item34", "item35", "item36", "item37", "item38", "item39", "item40", "item41", "item42", "item43", "item44", "item45", "item46", "item47", "item48", "item49", "item50", "item51", "item52", "item53", "item54", "item55", "item56", "item57", "item58", "item59", "item60", "item61", "item62", "item63", "item64", "item65", "item66", "item67", "item68", "item69", "item70", "item71", "item72", "item73", "item74", "item75", "item76", "item77", "item78", "item79", "item80", "item81", "item82", "item83", "item84", "item85", "item86", "item87", "item88", "item89", "item90", "item91", "item92", "item93", "item94", "item95", "item96", "item97", "item98", "item99", "item100");
$max = 200;
$length = 0;
$menu_items = array();
foreach($array as $value){
$length += strlen($value);
if($length <= $max){
$menu_items[] = $value;
}else{
break;
}
}
// Outputing the menu:
echo '<ul><li>'. implode('</li><li>', $menu_items) .'</li></ul>';
在线演示。
您可以在这里查看:
foreach($a as $b){
if(strlen($c)<200) $c.=$b.'|'; else return;
}