How to intercept characters in laravel

Laravel is a popular PHP framework that provides a lot of features and tools to quickly build web applications. In actual development, we often need to process strings, such as intercepting characters. This article will introduce how to intercept characters in Laravel.

1. Use PHP built-in functions to intercept characters

In Laravel, we can use PHP built-in functions to intercept characters. PHP provides three functions to intercept strings: substr(), mb_substr() and mb_strcut().

1. substr function

The substr function is one of PHP's built-in functions, used to intercept part of a string. This function takes three parameters: string, starting position, and length.

Sample code:

$str = "Hello world";
$substr = substr($str, 0, 5);
echo $substr; //输出 Hello

In the sample code, $str is the string to be intercepted, 0 is the starting position, and 5 is the length to be intercepted. The substr function returns the intercepted string.

2. mb_substr function

The mb_substr function is a string interception function for multi-byte character sets. Its parameters and usage are the same as the substr function, but it can handle multi-byte characters such as Chinese. It should be noted that using the mb_substr function requires enabling the mbstring extension in php.ini.

Sample code:

$str = "你好，世界";
$substr = mb_substr($str, 0, 2, 'utf-8');
echo $substr; //输出 你好

In the sample code, $str is the string to be intercepted, 0 is the starting position, 2 is the length to be intercepted, 'utf-8' represents the character string encoding. The mb_substr function returns the intercepted string.

3. mb_strcut function

The mb_strcut function is also a string interception function for multi-byte character sets. Its parameters and usage are the same as the mb_substr function, but it can ensure that the intercepted result does not contain half a character.

Sample code:

$str = "你好，世界";
$substr = mb_strcut($str, 0, 2, 'utf-8');
echo $substr; //输出 你好

2. Use Laravel’s string operation functions to intercept characters

Laravel provides many string operation functions that can simplify our operation of intercepting strings .

1. Str::substr function

Str::substr function is Laravel's string interception function. The parameters of this function are the same as those of the substr function.

Sample code:

use Illuminate\Support\Str;

$str = "Hello world";
$substr = Str::substr($str, 0, 5);
echo $substr; //输出 Hello

In the sample code, we need to introduce the Str class first, and then we can use the Str::substr function to intercept the string.

2. Str::limit function

Str::limit function is Laravel's function to limit the string length. This function takes three parameters: string, length, and trailing character.

Sample code:

use Illuminate\Support\Str;

$str = "Hello world";
$limitStr = Str::limit($str, 5, '...');
echo $limitStr; //输出 Hello...

In the sample code, $str is the string to be intercepted, 5 is the length to be intercepted, and '...' is the end character. The Str::limit function returns the intercepted string.

3. Str::words function

Str::words function is Laravel’s function that limits the number of words. This function takes three parameters: string, number of words, and ending character.

Sample code:

use Illuminate\Support\Str;

$str = "Hello world, how are you doing today?";
$wordsStr = Str::words($str, 3, '...');
echo $wordsStr; //输出 Hello world, how...

In the sample code, $str is the string to be intercepted, 3 is the number of words to be intercepted, and '...' is the ending character. The Str::words function returns the intercepted string.

Summary

This article introduces two methods of intercepting characters in Laravel: using PHP built-in functions and using Laravel's string manipulation functions. Multi-byte characters can be processed using PHP's built-in functions, but the mbstring extension needs to be enabled in php.ini; using Laravel's string manipulation functions can simplify development and limit the string length or number of words. Just choose different methods according to actual needs.

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