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Using str_limit to restrict a string to a certain length

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[开发(php) 所属分类 开发(php) | 发布者 店小二03 | 时间 2016 | 作者 红领巾 ] 0人收藏点击收藏

When building for the web, there are many different ways to limit a string. For example, you could use CSS, javascript, or do it throughphp.

Limiting strings is such a common use case that Laravel provides a simple helper to make this easy and I’ve recorded a short video to give you an example walkthrough:

The str_limit is autoloaded and available in both your application code and your views. Here is a simple example demonstrating the default use case. The first parameter is your string and the second is the length you want to trim it too. In this situation seven characters:

$value = str_limit('This string is really really long.', 7); // This st...

This helper also includes a third parameter so you change the ending on the trimmed string. For instance, pretend you want to have an arrow instead of three dots. That can be setup like this:

$value = str_limit('This string is really really long.', 7, '&raquo'); // This st

If you want to learn more about this helper look at the Illuminate\Support\Str class which is where the underlying code is:

public static function limit($value, $limit = 100, $end = '...') { if (mb_strwidth($value, 'UTF-8') <= $limit) { return $value; } return rtrim(mb_strimwidth($value, 0, $limit, '', 'UTF-8')).$end; }

The first if checks to see if the string is less than the limit using the Multi-Byte mb_strwidth PHP function. Finally, it does a right trim and the Multi-Byte mb_strimwidth to truncate the string to a specific length.

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