Assoc array to SQL where

sql_where.php

<?php

/**
 * Makes SQL compatible WHERE statement from assoc array where array's keys are table's columns, but values - rows.
 * 
 * @param  array  `array('a' => 'foo', 'b' => 123, 'c' => 'bar',)`
 * @return string `WHERE `a` = 'foo' AND `b` = 123 AND `c` = 'bar'`
 * 
 * @author daGrevis
 */
function sql_where(array $where) {

	$sql = '';
	$i = 0;
	
	foreach ($where as $k => $v) {
		
		if ($i === 0) {
			
			$sql .= 'WHERE';
		
		} else {
		
			$sql .= ' AND';
		
		}
		
		if (is_string($v)) {
		
			$v = "'$v'";
		
		}
		
		$sql .= " `$k` = $v";
		
		++$i;
		
	}

	return $sql;

}

$foo = array('a' => 'foo', 'b' => 123, 'c' => 'bar',);

echo sql_where($foo);