<?php

// сюда нужно вписать токен вашего бота
define('TELEGRAM_TOKEN', '999999999:XXXXXXXXXXXXXXXXXXXXXXXXXXXX');

// сюда нужно вписать ваш внутренний айдишник
define('TELEGRAM_CHATID', '99999999');

message_to_telegram('Привет!');

function message_to_telegram($text)
{
    $ch = curl_init();
    curl_setopt_array(
        $ch,
        array(
            CURLOPT_URL => 'https://api.telegram.org/bot' . TELEGRAM_TOKEN . '/sendMessage',
            CURLOPT_POST => TRUE,
            CURLOPT_RETURNTRANSFER => TRUE,
            CURLOPT_TIMEOUT => 10,
            CURLOPT_POSTFIELDS => array(
                'chat_id' => TELEGRAM_CHATID,
                'text' => $text,
            ),
            CURLOPT_PROXY => 'host:port',
            CURLOPT_PROXYUSERPWD => 'login:password',
            CURLOPT_PROXYTYPE => CURLPROXY_HTTP,
            CURLOPT_PROXYAUTH => CURLAUTH_BASIC,
        )
    );
    curl_exec($ch);
}

<?php

// сюда нужно вписать токен вашего бота
define('TELEGRAM_TOKEN', '999999999:XXXXXXXXXXXXXXXXXXXXXXXXXXXX');

// сюда нужно вписать ваш внутренний айдишник
define('TELEGRAM_CHATID', '99999999');

message_to_telegram('Привет!');

function message_to_telegram($text)
{
    $ch = curl_init();
    curl_setopt_array(
        $ch,
        array(
            CURLOPT_URL => 'https://api.telegram.org/bot' . TELEGRAM_TOKEN . '/sendMessage',
            CURLOPT_POST => TRUE,
            CURLOPT_RETURNTRANSFER => TRUE,
            CURLOPT_TIMEOUT => 10,
            CURLOPT_POSTFIELDS => array(
                'chat_id' => TELEGRAM_CHATID,
                'text' => $text,
            ),
        )
    );
    curl_exec($ch);
}

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

$a = 1 + '1text';
echo $a; // 2

$b = 1 + 'text';
echo $b; // 1

$c = '';
$d = 1 + $c;
echo $d; // 1

Notice: A non well formed numeric value encountered in test.php on line 5
2
Warning: A non-numeric value encountered in test.php on line 8
1
Warning: A non-numeric value encountered in test.php on line 12
1

$c = '';
$d = 1 + (int)$c;

function validate_russian_phone_number($tel)
{
    $tel = trim((string)$tel);
    if (!$tel) return false;
    $tel = preg_replace('#[^0-9+]+#uis', '', $tel);
    if (!preg_match('#^(?:\\+?7|8|)(.*?)$#uis', $tel, $m)) return false;
    $tel = '+7' . preg_replace('#[^0-9]+#uis', '', $m[1]);
    if (!preg_match('#^\\+7[0-9]{10}$#uis', $tel, $m)) return false;
    return $tel;
}

function sklonyalka($n, $v1, $v2, $v5)
{
    return $n % 100 < 10 || $n % 100 > 20 ? ($n % 10 == 1 ? $v1 : ($n % 10 >= 2 && $n % 10 <= 4 ? $v2 : $v5)) : $v5;
}

В вашей корзине <b><?php echo $items_number; ?></b> <?php echo sklonyalka($items_number, 'товар', 'товара', 'товаров'); ?>.

function sklonyalka(n, v1, v2, v5)
{
    return n % 100 < 10 || n % 100 > 20 ? (n % 10 == 1 ? v1 : (n % 10 >= 2 && n % 10 <= 4 ? v2 : v5)) : v5;
}

\frac{1}{\sigma\sqrt{2\pi}}\exp\left(-\frac{(x-\mu)^2}{2\sigma^2}\right)

function latex2image($text)
{
    return 'http://chart.apis.google.com/chart?cht=tx&chl=' . urlencode($text);
}

<?php echo "Привет, мир!"; ?>

<span class="fg-time" data-time="xxxxx" data-format="j F Y, H:i">
    9 September 2014, 23:17 GMT
</span>

$('.fg-time').each(function(){
     var time = $(this).data('time'),
          format = $(this).data('format');
     $(this).text(fgDate(format, time));
});