How to intercept the first digits of the string in the array in php

PHP is a server-side scripting language widely used in web development and has a wide range of application fields. In PHP, intercepting the first few digits of a string in an array is a common operation. This article will introduce how to use PHP to intercept the first few digits of a string in an array.

1. Substr function

In PHP, you can use the substr function to intercept part of a string. The syntax is as follows:

substr(string $string, int $start, int $length): string

Among them, $string is the string to be intercepted, $start is the starting position of interception, $length is the length of interception, and the return value is the intercepted substring.

So, how to use the substr function to intercept the first few characters of the string in the array?

We can use a loop to traverse the array and intercept each string. The specific implementation code is as follows:

$array = array("apple", "banana", "cherry");
$length = 3; // 截取的长度

foreach ($array as &$value) {
  $value = substr($value, 0, $length);
}

// 输出结果
print_r($array);

This code first defines an array containing three strings, and then loops through each string and uses the substr function to intercept. The intercepted length is the variable $length. Finally output the intercepted result.

2. Array_map function

In PHP, you can use the array_map function to operate on each element in the array. The syntax is as follows:

array_map(callable $callback, array $array1, array ...$arrays): array

Among them, $callback is the callback function to be executed on the array elements, $array1 is the array to be operated on, and $arrays is other arrays to be operated on. The return value is the new processed array.

So, how to use the array_map function to intercept the first few characters of the string in the array?

We can achieve this by defining an anonymous function. The specific implementation code is as follows:

$array = array("apple", "banana", "cherry");
$length = 3; // 截取的长度

$array = array_map(function($value) use($length) {
  return substr($value, 0, $length);
}, $array);

// 输出结果
print_r($array);

This code first defines an array containing three strings, and then operates on each element through the array_map function. Here we use an anonymous function to intercept each string using the substr function, and the intercepted length is the variable $length. Finally output the result of the operation.

3. Conclusion

In PHP, by using the substr function or array_map function, you can easily intercept the first few characters of the string in the array. WeChat mini programs have become a popular trend on the Internet. I believe that with the popularity of mini programs, the demand for PHP will also increase. I hope this introduction can be helpful to everyone.

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