How to query Google Cloud Platform Natural Language API using cURL in PHP (example code)

The following short example shows a simple example of how to query Google Natural Language API by posting JSON as text using cURL in PHP.

This code is a simplified version of example code offered by Google on the following page, which uses cURL commands directly from the command line.

Using the below code, you can easily adjust the data posted to https://language.googleapis.com/v1/documents:analyzeEntities API, by specifying your own content.

<?php
// Data in JSON format
$data = '{
"document":{
"type":"PLAIN_TEXT",
"content":"Joanne Rowling, who writes under the pen names J. K. Rowling and Robert Galbraith, is a British novelist and screenwriter who wrote the Harry Potter fantasy series."
},
"encodingType":"UTF8"
}';
$google_nlp_api = "YOUR API KEY";
$payload = $data;
$url = 'https://language.googleapis.com/v1/documents:analyzeEntities?key='.$google_nlp_api;
// Prepare new cURL resource
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
// Set HTTP Header for POST request
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
'Content-Type: application/json',
'Content-Length: ' . strlen($payload))
);
// Submit the POST request
$result = curl_exec($ch);
echo print_r($result);
// Close cURL session handle
curl_close($ch);
?>

The code above properly retrieves all of the entities of text after analysis by Google Natural Language API:

{
"entities": [
{
"name": "Joanne Rowling",
"type": "PERSON",
"metadata": {
"mid": "/m/042xh",
"wikipedia_url": "https://en.wikipedia.org/wiki/J._K._Rowling"
},
"salience": 0.79828626,
"mentions": [
{
"text": {
"content": "Joanne Rowling",
"beginOffset": 0
},
"type": "PROPER"
},
{
"text": {
"content": "Rowling",
"beginOffset": 53
},
"type": "PROPER"
},
{
"text": {
"content": "novelist",
"beginOffset": 96
},
"type": "COMMON"
},
{
"text": {
"content": "Robert Galbraith",
"beginOffset": 65
},
"type": "PROPER"
}
]
},
{
"name": "pen names",
"type": "OTHER",
"metadata": {},
"salience": 0.07300248,
"mentions": [
{
"text": {
"content": "pen names",
"beginOffset": 37
},
"type": "COMMON"
}
]
},
{
"name": "J.K.",
"type": "PERSON",
"metadata": {},
"salience": 0.043804582,
"mentions": [
{
"text": {
"content": "J. K.",
"beginOffset": 47
},
"type": "PROPER"
}
]
},
{
"name": "British",
"type": "LOCATION",
"metadata": {
"mid": "/m/07ssc",
"wikipedia_url": "https://en.wikipedia.org/wiki/United_Kingdom"
},
"salience": 0.019752095,
"mentions": [
{
"text": {
"content": "British",
"beginOffset": 88
},
"type": "PROPER"
}
]
},
{
"name": "fantasy series",
"type": "WORK_OF_ART",
"metadata": {},
"salience": 0.01764168,
"mentions": [
{
"text": {
"content": "fantasy series",
"beginOffset": 149
},
"type": "COMMON"
}
]
},
{
"name": "Harry Potter",
"type": "WORK_OF_ART",
"metadata": {
"wikipedia_url": "https://en.wikipedia.org/wiki/Harry_Potter",
"mid": "/m/078ffw"
},
"salience": 0.014916742,
"mentions": [
{
"text": {
"content": "Harry Potter",
"beginOffset": 136
},
"type": "PROPER"
}
]
},
{
"name": "screenwriter",
"type": "PERSON",
"metadata": {},
"salience": 0.011085264,
"mentions": [
{
"text": {
"content": "screenwriter",
"beginOffset": 109
},
"type": "COMMON"
}
]
}
],
"language": "en"
}

 

 

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