JSON, or JavaScript Object Notation, is a popular data format that is widely used in web development. JSON is easy to read and write, and can store complex data structures such as arrays, objects, and nested values. JSON is often used to exchange data between web servers and clients, or to store data in local files or databases.
PHP, or Hypertext Preprocessor, is a powerful scripting language that runs on the server side. PHP can handle various tasks such as processing forms, sending emails, connecting to databases, and generating dynamic web pages. PHP can also work with JSON data, either by creating JSON strings from PHP variables, or by parsing JSON strings into PHP variables.
Parsing JSON in PHP means converting a JSON string into a PHP variable that can be manipulated and used in the PHP code. Parsing JSON in PHP can be useful for many purposes, such as fetching data from an API, reading data from a file, or validating data from a user input.
One way to parse JSON in PHP is to use the built-in function json_decode(). This function takes a JSON string as an argument and returns a PHP variable that corresponds to the JSON value. The json_decode() function can also take an optional second argument that specifies whether to return an associative array or an object. By default, the function returns an object, but if the second argument is set to true, it returns an associative array.
To parse JSON in PHP from a URL, we need to first get the JSON string from the URL using another built-in function called file_get_contents(). This function reads the contents of a file or a URL and returns it as a string. We can then pass this string to the json_decode() function and get the PHP variable that represents the JSON data.
Here is an example of how to parse JSON in PHP from a URL:
How to "Parse JSON PHP from URL"
// The URL that contains the JSON data
$url = "https://example.com/api/data.json";
// Get the JSON string from the URL
$json = file_get_contents($url);
// Parse the JSON string into a PHP variable
$data = json_decode($json, true);
// Print the PHP variable
print_r($data);
This code will output something like this:
Array(
[name] => John Doe
[age] => 25
[hobbies] => Array(
[0] => Reading
[1] => Coding
[2] => Gaming
)
)
We can now access and use the elements of the $data variable in our PHP code. For example, we can print the name of the person like this:
echo "The name is " . $data["name"] . "\n";
This will output:
The name is John Doe
We can also loop through the hobbies array and print each hobby like this:
echo "The hobbies are:\n";
foreach ($data["hobbies"] as $hobby) {
echo "- " . $hobby . "\n";
}
This will output:The hobbies are:
• Reading
• Coding
• Gaming
So if you want to parse JSON in PHP from URL, you can try to use file_get_contents API.
This function is similar to file(), except that file_get_contents() returns the file in a string, starting at the specified offset up to maxlen bytes. On failure, file_get_contents() will return FALSE.
file_get_contents() is the preferred way to read the contents of a file into a string. It will use memory mapping techniques if supported by your OS to enhance performance.
Note:
If you're opening a URI with special characters, such as spaces, you need to encode the URI with urlencode().
$json_url = "https://maps.googleapis.com/maps/api/directions/json?origin=" . urlencode($_POST['address1']) . "&destination=" . urlencode($_POST['address2']) . "&key=AIzaSyCMcrBGtTId8BXGD6UgcRatWSvBAaCH5mQ";
OR
$json_url = "https://maps.googleapis.com/maps/api/directions/json?origin=lê văn sĩ, quận 3&destination=la văn cầu, vũng tàu"&key=AIzaSyCMcrBGtTId8BXGD6UgcRatWSvBAaCH5mQ";
$obj = file_get_contents($json_url);
$result = json_decode($obj);
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Example:
JSON data from result same as the above image:If you want to access this value:
Your code here:
$result->{"routes"}[0]->{"legs"}[0]->{"distance"}->{"text"}; // 102
$result->{"routes"}[0]->{"legs"}[0]->{"distance"}->{"value"}; // 102088
$result->{"routes"}[0]->{"copyrights"}; // Map data @2017 Google
As you can see, parsing JSON in PHP from a URL is not very difficult.
You just need to use two built-in functions: file_get_contents() and
json_decode(). With these functions, you can easily work with JSON data
in your PHP projects.
I hope this description was helpful for
you. If you want to learn more about how to parse JSON in PHP, you can
check out these resources:
• [PHP Manual: json_decode]
• [PHP Manual: file_get_contents
Related topic:
[C#] Read JSON file
[C#] Convert JSON to string array
