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$x="123xadg2hj5ed";

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$str="5555555ddd";
ereg("[0-9]",$str,$a);
echo $a;
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preg_match("/[0-9]+/",$str,$a);

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$str = "5555555ddd";
ereg("[0-9]+",$str,$a);
print_r($a);//Array ( [0] => 5555555 )


$str = "123xadg2hj5ed";
preg_match_all("/[0-9]+/",$str,$a);
print_r($a);//Array ( [0] => Array ( [0] => 123 [1] => 2 [2] => 5 ) )

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PHP code:
<?php
$x="123xadg2hj5ed";
echo preg_replace('/\D+/','',$x);//Êý×ÖÈ«²¿Á¬ÆðÀ´
preg_match_all('/\d+/',$x,$r);//Êý×ÖÒª·Ö¿ª
print_r($r[0]);
?>

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$str = "5555555ddd";
ereg("[0-9]+",$str,$a);
print_r($a);//Array ( [0] => 5555555 )


$str = "123xadg2hj5ed";
preg_match_all("/[0-9]+/",$str,$a);
print_r($a);//Array ( [0] => Array ( [0] => 123 [1] => 2 [2] => 5 ) )

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$x          = "123xadg2hj5ed";
$pattern    = '/\d?/';
preg_match_all($patt