How to convert numeric string to array in php

Conversion method: 1. Use explode() to split the string into several substrings according to specific delimiters, and then combine the substrings into an array; the syntax format is "explode(separator, string)". 2. Use str_split() to split the string into an array, the syntax format is "str_split(string)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

numeric characters in php String to array

1. Use the explode() function

During the development process, we often encounter the need to convert a string into an array Case. PHP has a built-in explode() function that can split a string into several parts based on specific delimiters.

explode() function can split a string based on the string delimiter, that is, it splits a string into several substrings based on the delimiter, and then combines these substrings into an array and returns it. The syntax format is as follows:

explode($delimiter, $string [, $limit])

The parameter description is as follows:

• $delimiter: the delimiter character used to split the string;

• $string: The string that needs to be split;

• $limit: Optional parameter, which can be empty, specifies the number of array elements to be returned;

  • If $limit is not empty and is a positive number, the returned array contains at most $limit elements, and the last element contains the remainder of $string;

  • If $limit is not empty and is negative, all elements except the last $limit elements are returned;

  • If $limit is 0, it will be treated as 1;

  • If $limit is empty, it means returning all array elements.

If $delimiter is an empty string"", the program will prompt a Warning, and the explode() function will return FALSE; if If the value contained in $delimiter is not found in $string, and a negative $limit is used, an empty array will be returned, otherwise an array containing a single element of $string will be returned.

<?php
    $str = &#39;544527258895525404524.54434245657&#39;;
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    $arr = explode(&#39;2&#39;, $str);
    print_r($arr);
    $arr = explode(&#39;2&#39;, $str, 3);
    print_r($arr);
    $arr = explode(&#39;2&#39;, $str, -2);
    print_r($arr);
    $arr = explode(&#39;2&#39;, $str, 0);
    print_r($arr);
    $arr = explode(&#39;&#39;, $str);
    var_dump($arr);
    $arr = explode(&#39;@&#39;, $str, -1);
    print_r($arr);
?>

Output result:

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2. Use the str_split() function

str_split() function to split the string into an array.

Syntax

str_split(string,length)

The parameter description is as follows:

• string Required. Specifies the string to be split.

• #length Optional. Specifies the length of each array element. The default is 1.

Return value: If length is less than 1, the str_split() function will return FALSE. If length is greater than the length of the string, the entire string is returned as the only element of the array.

Example:

<?php
    $str = &#39;536546&#39;;
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    $arr = str_split($str);
    print_r($arr);
	$arr = str_split($str,3);
    print_r($arr);
?>

Output result:

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