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How to escape string in php array
- PHPzOriginal
- 2023-04-20 15:01:33567browse
PHP is a flexible and easy-to-use programming language that is widely used in web development and server-side programming. In PHP, array is a very important data structure used to store and process data collections of multiple elements. The elements in the array can be numbers, strings, objects, arrays, etc. In some cases, we need to convert an array into a string that can be used for storage or transmission. In this case, we need to use the array escape string function.
In PHP, there are two functions that can be used to implement this function, namely "serialize()" and "json_encode()". The usage of these two functions are introduced below:
- serialize() function
serialize() function can serialize an array into a string. The serialized string can be saved in a file, database, or transmitted to other programs over the network. When we need to use this array, we can use the "unserialize()" function to deserialize the string into the original array form. Serialized strings can be compressed, so bandwidth and storage space can be saved when processing large amounts of data.
The following is an example of using the serialize() function:
$arr = array('name'=>'张三', 'age'=>18, 'gender'=>'男');
$str = serialize($arr);
echo $str; //输出：a:3:{s:4:"name";s:6:"张三";s:3:"age";i:18;s:6:"gender";s:6:"男";}
In the above example, we assign an associative array to the variable "$arr", and then use the serialize() function to Convert it to string. The output result is a serialized string containing all keys and values in the array. There is a letter "a" at the beginning of the string, indicating that it is an array; there is a number "3" after it, indicating that the array has 3 elements; followed by three sets of strings, corresponding to the three elements of the array. Each group of strings consists of the form "s:number:string", where "number" represents the number of characters in the string, and the numbers before and after the ":" sign together represent the number of bytes occupied by the string.
- json_encode() function
json_encode() function can convert an array into a string in JSON format. JSON (JavaScript Object Notation) is a lightweight data exchange format that is easy to read, write, and parse. It is widely used in Web front-end development and mobile development. Different from the serialize() function, the string returned by the json_encode() function is a plain text string that can be directly transmitted and parsed without the need for deserialization.
The following is an example of using the json_encode() function:
$arr = array('name'=>'张三', 'age'=>18, 'gender'=>'男');
$str = json_encode($arr);
echo $str; //输出：{"name":"张三","age":18,"gender":"男"}
In the above example, we assign an associative array to the variable "$arr", and then use the json_encode() function to Convert it to a JSON formatted string. The output result is a plain text string, in which each key-value pair is wrapped in double quotes """, the key and value are separated by colon ":", and different key-value pairs are separated by commas "," Separated.
Summary
PHP provides two powerful functions for escaping arrays into strings. Use the serialize() function to serialize the array and output the result is a binary string; using the json_encode() function can convert the array into a string in JSON format, and the output result is a plain text string. In actual development, we can choose the appropriate function according to actual needs to implement the array Escape function.
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