如何获取字符串PHP的一部分?

My string is like this 1/2/3/33/34.

Now i want to get 3/33/34 only this part,

I am getting so many string in all string 1/2/ this is common n i want to get string after 1/2/ this string

echo substr('1/2/3/33/34',4);

That takes out 1/2/ (first four letters of the string)

Fiddle

$aa="1/2/3/33/34";
$aa=str_replace("1/2/","",$aa);
$newstring = str_replace("1/2/", "", "1/2/3/33/34");
<?php
echo str_replace("1/2/","","1/2/3/33/34");
?>

$a='1/2/3/33/34';

( ($pos=strpos($a,'/3'))!==false || ($pos=strlen($a)) ) && ($str=substr($a,$pos));

/* now result in $str */

echo $str;

// output: "/3/33/34" // or empty string "" if no '/3' found

<?php
 echo substr("1/2/3/33/,4);
?>
<?php
echo str_replace("1/2/", "", "1/2/3/33/44"); // outputs Hello Dolly!
?>