<?php
 
$input = '1 10 100 1000 10000 100000';
 
define('TOKEN_NUMBER', 0);
 
$pos = 0;
$len = strlen($input);
 
$tokenList = array();
 
while ($pos < $len) {
	$char = $input[$pos];
 
	// number
	if (ctype_digit($char)) {
		$number = $char;
		$pos++;
 
		while ($pos < $len && ctype_digit($input[$pos])) {
			$number .= $input[$pos++];
		}
 
		$tokenList[] = array(TOKEN_NUMBER, $number);
	} else
 
	// space
	if ($char === ' ') {
		$pos++;
		// no token
	}
}
 
foreach ($tokenList as $token) {
	echo $token[0] . ' => ' . $token[1] . "\r\n";
}

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