nozzy

Пропиши абсолютный путь к файлу

$file = file_get_contents(__DIR__ . '/wp-config.php');

Не проверял, как то так

$sub_query = "SELECT t3.`auto_sel_ecu_id` FROM `auto_sel_brand` t1
JOIN `auto_sel_model` t2 ON t2.`auto_sel_model_brand` = t1.auto_sel_brand_id AND t2.`auto_sel_model_name` = '$model'
JOIN `auto_sel_motor` t3 t3.`auto_sel_model_brand` = t2.'auto_sel_brand_id' AND AND `auto_sel_ecu_name` = '$capacity'
WHERE t1.`auto_sel_brand_name` = '$brand' AND t1.`auto_sel_brand_type` = '$type'";

$query = "SELECT `auto_sel_motor_name` FROM `auto_sel_ecu` WHERE `auto_sel_motor_model` IN ('$sub_query')";

$result = $dbc->query($query) or DIE($dbc->error);

....

https://github.com/colshrapnel/safemysql

Lumen
https://lumen.laravel.com/

$output = shell_exec('php script2.php arg1 arg2');
echo $output;

script2.php:

<?php
print_r($argv);
?>

print_r($argv) выводит массив:

Array
(
    [0] => script2.php
    [1] => arg1
    [2] => arg2
)

$dom = new DOMDocument;
$dom->loadHTML($html);
$link = $dom->getElementById( 'link' );
if($link->hasAttribute( 'href' )){
          $href = $link->getAttribute( 'href' );
          echo $href;
     }

В Laravel для этого есть Collection и groupBy.
Что бы использовать Collection без Laravel,
установи:
composer require tightenco/collect

<?php
require '/vendor/autoload.php';
use Illuminate\Support\Collection;

$array = array(
    array('id' => '7', 'name' => 'foo'),
    array('id' => '7', 'name' => 'foo2'),
    array('id' => 10, 'name' => 'bar'),
    array('id' => 10, 'name' => 'bar2'),
    array('id' => 11, 'name' => 'bar3')
);

$collection = new Collection($array);

$grouped = $collection->groupBy('id');

$grouped->each(function ($item, $key) {
    print_r($key . PHP_EOL);
    print_r($item);
});

https://github.com/morris/lessql

$sql = "INSERT INTO db_users_a (user, email, pass, referer, referer_id, date_reg, ip) 
VALUES (?, ?, ?, ?, ?, ?, ?)";
$arr = array('$login', '$email', '$pass', 'admin', '1', '$time', INET_ATON('$ip'));
$db->prep($sql, $arr);

Посмотри, что у тебя в connection_db:

public function __destruct() {
    die(var_dump($this -> connection_db));
    mysql_close($this -> connection_db);
  }

Использовать Curl

$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'blabla: 0',
    'blabla: 1'
));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            "postvar1=value1&postvar2=value2&postvar3=value3");

https://stackoverflow.com/questions/9841635/how-ca...

$text = trim(preg_replace('/\s+/',' ', $text));

$response = file_get_contents('https://111.111.1.1/callback.php?phone=380666666666');