数据库拆分字符串函数_PHP | 不使用库函数将逗号分隔的字符串拆分为数组

古城微笑少年丶 2023-03-05 04:29 20阅读 0赞

数据库拆分字符串函数

Given a string with comma delimited, we have to split it into an array.

给定一个以逗号分隔的字符串，我们必须将其拆分为一个数组。

**Example:**

**例：**

Input: 
        "Google,Bing,Yahoo!,DuckDuckGo"
    
        Output:
        arrar of strings after splitting...
        Array
        (
            [0] => Google   
            [1] => Bing     
            [2] => Yahoo!   
            [3] => DuckDuckGo
        )

### PHP代码将逗号分隔的字符串拆分为数组，而无需使用库函数 **(**PHP code to split comma delimited string into an array without using library function**)** ###

<?php
    //PHP code to reverse the string without 
    //using library function
    
    //function definition 
    //it accepts a string and returns an array 
    //delimited by commas
    function split_string($text){
        
        //variable to store the result i.e. an array 
        $arr = [];
        //calculate string length
        $strLength = strlen($text);
        $dl = ','; //delimeter
        $j = 0;
        $tmp = ''; //a temp variable
        //logic - it will check all characters
        //and split the string when comma found
        for ($i = 0; $i < $strLength; $i++) {
        
        	if($dl === $text[$i]) {
        
        		$j++;
        		$tmp = '';
        		continue;
        	}
        	$tmp .= $text[$i];
        	$arr[$j] = $tmp;
        }
        //return the result
        return $arr;
    }
    
    //main code i.e. function calling
    $str = "New Delhi,Mumbai,Chennai,Banglore";
    $result = split_string($str);
    echo "string is: " .$str. "<br/>";
    echo "arrar of strings after splitting..."."<br/>";
    print_r($result);
    
    $str = "Google,Bing,Yahoo!,DuckDuckGo";
    $result = split_string($str);
    echo "string is: " .$str. "<br/>";
    echo "arrar of strings after splitting..."."<br/>";
    print_r($result);
    ?>

**Output**

**输出量**

string is: New Delhi,Mumbai,Chennai,Banglore
    arrar of strings after splitting...
    Array
    (
        [0] => New Delhi
        [1] => Mumbai
        [2] => Chennai
        [3] => Banglore
    )
    string is: Google,Bing,Yahoo!,DuckDuckGo
    arrar of strings after splitting...
    Array
    (
        [0] => Google   
        [1] => Bing     
        [2] => Yahoo!   
        [3] => DuckDuckGo
    )

**Explanation:**

**说明：**

We use a for loop to convert our comma delimited string into an array. We identify when a (,) appears in the string and copy that into an array then follow this process until the whole length of the string is covered. The inverted string is stored into a temporary variable ($tmp) then moved to an array ($arr\[\]).

我们使用for循环将逗号分隔的字符串转换为数组。 我们确定字符串中何时出现( ， )，然后将其复制到数组中，然后执行此过程，直到覆盖整个字符串。 倒置的字符串存储到一个临时变量( $ tmp )中，然后移到一个数组( $ arr \[\] )中。

> 翻译自: [https://www.includehelp.com/php/split-comma-delimited-string-into-an-array-without-using-library-function.aspx][https_www.includehelp.com_php_split-comma-delimited-string-into-an-array-without-using-library-function.aspx]

数据库拆分字符串函数

[https_www.includehelp.com_php_split-comma-delimited-string-into-an-array-without-using-library-function.aspx]: https://www.includehelp.com/php/split-comma-delimited-string-into-an-array-without-using-library-function.aspx