Simple use of the Bing Spell Check API in PHP

bingspellcheck.php

<?php

// See https://www.microsoft.com/cognitive-services/en-us/bing-spell-check-api for API details.

namespace bing\spellcheck;

require_once('conf/base.conf.php');

function _getSuggestions($input) {
    $subkey = MICROSOFT_COGNITIVE_API_KEY;
    $cl = curl_init('https://api.cognitive.microsoft.com/bing/v5.0/spellcheck/?mode=proof&mkt=en-us');
    curl_setopt($cl, CURLOPT_POST, true);
    curl_setopt($cl, CURLOPT_HTTPHEADER, array("Content-Type: application/x-www-form-urlencoded", "Ocp-Apim-Subscription-Key: $subkey"));
    curl_setopt($cl, CURLOPT_POSTFIELDS, "Text=$input");
    curl_setopt($cl, CURLOPT_RETURNTRANSFER, true);
    $ret = curl_exec($cl);
    curl_close($cl);
    $ret = json_decode($ret, true);
    return $ret;
}

function correctText($input) {
    $corrections = _getSuggestions($input);
    $outp = $input;
    
    if ( key_exists('flaggedTokens', $corrections) ) {
        foreach ( $corrections['flaggedTokens'] as $c ) {
            $outp = substr_replace($outp, $c['suggestions'][0]['suggestion'],
                                   $c['offset'], strlen($c['token']));
        }
    }
    return $outp;
}