How to convert array to string in php

In PHP programming, we often need to convert an array into a string. To achieve this goal, PHP provides a number of different ways, some of which we will introduce below.

1. Implode function

The implode function is the most commonly used function to concatenate array elements into strings. Usage is very simple, just pass the array as a parameter to the function. For example:

<?php
 $arr = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;);
 $str = implode(&#39;,&#39;, $arr);  // 用逗号连接数组元素
 echo $str;
 ?>

The output result is:

a,b,c

As you can see, the elements in the array are connected with commas to form a string.

2. Join function

The function of join function and implode function are basically the same. It is also used to connect array elements into strings. Different from the implode function, the parameter order of the join function is opposite to that of the implode function. The first parameter is the string used to connect the array elements, and the second parameter is the array to be connected, for example:

<?php
 $arr = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;);
 $str = join(&#39;,&#39;, $arr);  // 用逗号连接数组元素
 echo $str;
?>

The output result is:

a,b,c

The result is the same as the implode function.

3. Serialize function

The serialize function is used to serialize an array into a string. After serialization, we can save it to a file or database for later reading. For example:

<?php
 $arr = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;);
 $str = serialize($arr);
 echo $str;
?>

The output result is:

a:3:{i:0;s:1:"a";i:1;s:1:"b";i:2;s:1:"c";}

It can be seen that the serialized string contains all the elements in the array and their type, length and other information.

4. json_encode function

The json_encode function is used to convert an array into a string in JSON format. JSON format is a lightweight data exchange format that can be supported by multiple programming languages. For example:

<?php
 $arr = array(&#39;name&#39; => '张三', 'age' => 23);
 $str = json_encode($arr);
 echo $str;
?>

The output result is:

{"name":"张三","age":23}

You can see that the key-value pairs in the array are converted into a JSON format object.

Summary

Through this article, we learned about four common ways to convert arrays into strings. Among them, the implode function and the join function are the two most commonly used methods, and their functions are basically the same. The serialize function and json_encode function are used to serialize arrays into strings and convert arrays into JSON format strings respectively, which are suitable for different application scenarios. In actual programming, we can choose different methods according to specific needs.

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