mysql bootsrap class for php

mysql bootsrap class.php

<?php

header('Content-type: text/html; charset=utf-8');
// header('Content-type: text/plain; charset=utf-8');

ini_set('display_errors', 1);
ini_set('track_errors', 1);
ini_set('html_errors', 1);
ini_set('realpath_cache_size', '5M');
ini_set('max_execution_time', 9999999900000);
error_reporting(E_ALL);

define('_USER_', 'username');
define('_PASSWD_', 'password');
define('_DB_', 'database');

global $mysqli;
$mysqli = new mysqli('localhost', _USER_, _PASSWD_, _DB_);

$timeStart = microtime(true);

$mysqli->query('SELECT * FROM schema.table');

$timeEnd = microtime(true);

$time = $timeEnd - $timeStart;
echo PHP_EOL . "Execution time : $time";
echo PHP_EOL . '--- END ---';
die();

/**
 * Execute an array of sql for updating base
 *
 * @param $allSql
 *
 * @return bool
 */
function executeArray($allSql)
{
    global $mysqli;

    if ($mysqli->connect_errno) {
        echo '<br>----------------------------';
        echo '<br>Sorry, first try connect_errno.';
    }

    foreach ($allSql as $key => $sql) {
        if (!$result = $mysqli->query($sql)) {
            echo '<br>----------------------------';
            echo '<br>Sorry, here the problem:';
            echo '<br>Query: ' . $sql;
            echo '<br>Errno: ' . $mysqli->errno;
            echo '<br>Error: ' . $mysqli->error;
            exit;
        }
    }

    return true;
}

/**
 * Execute an SQL, and return an result array
 *
 * @return array of int
 */
function executeS($sql)
{
    global $mysqli;

    if ($mysqli->connect_errno) {
        echo '<br>----------------------------';
        echo '<br>Sorry, first try connect_errno.';
    }

    if (!$result = $mysqli->query($sql)) {
        echo '<br>----------------------------';
        echo '<br>Sorry, here the problem:';
        echo '<br>Query: ' . $sql;
        echo '<br>Errno: ' . $mysqli->errno;
        echo '<br>Error: ' . $mysqli->error;
        exit;
    }

    $rows = array();

    while ($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }

    return $rows;
}

/**
 * Execute only one sql for the setting of base eg ALTER ...
 *
 * @return bool
 */
function executeOne($sql)
{
    global $mysqli;

    if ($mysqli->connect_errno) {
        echo '<br>----------------------------';
        echo '<br>Sorry, first try connect_errno.';
    }

    if (!$result = $mysqli->query($sql)) {
        echo '<br>----------------------------';
        echo '<br>Sorry, here the problem:';
        echo '<br>Query: ' . $sql;
        echo '<br>Errno: ' . $mysqli->errno;
        echo '<br>Error: ' . $mysqli->error;
        exit;
    }

    return true;
}


/**
 * Execute an SQL, and return an result array
 *
 * @return array of int
 */
function getValue($sql)
{
    $result = connectAndExecuteSQL($sql);

    $rows = array();

    while ($row = $result->fetch_assoc()) {
        $rows[] = $row;
    }

    return $rows;
}

function connectAndExecuteSQL($sql, $is_array = null)
{
    global $mysqli;

    if ($mysqli->connect_errno) {
        echo '<br>----------------------------';
        echo '<br>Sorry, first try connect_errno.';
    }

    if (!$result = $mysqli->query($sql)) {
        echo '<br>----------------------------';
        echo '<br>Sorry, here the problem:';
        echo '<br>Query: ' . $sql;
        echo '<br>Errno: ' . $mysqli->errno;
        echo '<br>Error: ' . $mysqli->error;
        exit;
    }

    return $mysqli;
}