MySQL insert, select performance testing in PHP

mysql_insert_select_test.php

<?php
$dbhost = "localhost";
$dbuser = "root";
$dbpass = "";
$dbname = "cake";

$con = mysql_connect($dbhost, $dbuser, $dbpass);
if (!$con) die('Could not connect: ' . mysql_error());
mysql_select_db($dbname, $con);

$result = mysql_query("CREATE TABLE `blogs` (
  `id` INTEGER NULL AUTO_INCREMENT DEFAULT NULL,
  `name` VARCHAR(150) NULL DEFAULT NULL,
  `content` MEDIUMTEXT NULL DEFAULT NULL,
  `user_id` INTEGER NULL DEFAULT NULL,
  `created` DATETIME NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
);");
mysql_close($con);

runcmd("Insert");
runcmd("SelectAll");
runcmd("SelectRnd");


function runcmd ($type) {
	$num_entries = 40000;
	$echo_num_inserts = 200;
	$bulk_inserts = 1;
	$dbhost = "localhost";
	$dbuser = "root";
	$dbpass = "";
	$dbname = "cake";
	
	$con = mysql_connect($dbhost, $dbuser, $dbpass);
	if (!$con) die('Could not connect: ' . mysql_error());
	mysql_select_db($dbname, $con);
	
	$starttime = microtime(true);
	$inserts = "";
	foreach (range(1,$num_entries) as $i) {
		//  if (($i % $echo_num_inserts) == 0) echo "$i done.\n";
		if ($type === "Insert") {
			$name = rand_string (20);
			$content = rand_string (120);
			$userid = rand(0,100);
			$inserts .= "(0, '$name', '$content', '$userid', now())";
			$query = "INSERT INTO blogs (id, name, content, user_id, created) VALUES $inserts";
		} elseif ($type === "SelectAll") {
			$query = "SELECT * FROM blogs LIMIT 1000";
		} else {
			$id = rand(0,100);
			$query = "SELECT * FROM blogs WHERE id=$id";
		}
		if (($i % $bulk_inserts) == 0) {
			mysql_query($query);
			$inserts = "";
		} else {
			$inserts .= ", ";
		}
	}
	$endtime = microtime(true);
	$qps = $num_entries / ($endtime - $starttime);
	echo "$type qps = $qps\n";
	mysql_close($con);
}

function rand_string( $length ) {
	$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
	return substr(str_shuffle($chars),0,$length);
}

?>