How to read json file into array in php

How to read json files into arrays in php: 1. Use the "file_get_contents('file path')" statement to read and store the contents of the json file into a string; 2. Use "json_decode (json string, true)" statement to convert json data into an array.

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

php reads json Method of converting files into arrays

Implementation idea:

• Read the json file and read the data of the file content into a string Save

• Convert json string to array

Implementation method:

• Use file_get_contents(): Read the json file into a string

• json_decode(): Convert the json string into an array

  json_decode() function can Convert JSON encoded string to appropriate PHP data type.

  By default, the json_decode() function will return an object; however, when the second parameter is specified as a Boolean value true, the JSON value will be decoded into an associative array.
  

Implementation example:

There is such a test.json file, the content of which is:

Convert it to a PHP array:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$json_string=file_get_contents(&#39;test.json&#39;);
echo $json_string;
$arr=json_decode($json_string,true);   //将json字符串转成php数组
var_dump($arr);
?>

Description: file_get_contents() function

file_get_contents () function can read the contents of a file into a string, syntax:

file_get_contents($filename,$include_path,$context,$offset,$max_length)

Parameter description is as follows:

• $filename: the file name of the file to be read Name;

• $use_include_path: optional parameter, used to set whether you want to search for the file in include_path, the default is FALSE;

• $context: optional parameter, used to represent a valid context resource created using the stream_context_create() function. If you do not need to customize the context, you can use NULL to ignore it;

• $offset : Optional parameter, used to set the starting position in the file to read. Note that this parameter cannot be used for remote files;

• $maxlen: Optional parameter, used to set the number of bytes to be read. The default is to read the entire content of the file.

Note: When the file_get_contents() function fails to execute, it may return FALSE of Boolean type, or it may return a non-Boolean value (such as a null character). Therefore, the === operator is generally used to test the return value of this function.

Extended knowledge:

In addition to reading the file into a string, you can also read the entire file into an array, just use file( ) function. If you want to simply understand this function, you can parameterize the article "How to store the entire file data into an array line by line in php"

Recommended study: "PHP Video Tutorial"

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