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

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。