PHP：如何从字符串中获取特定单词

Question

This is my string:

$string="VARHELLO=helloVARWELCOME=123qwa";

I want to get 'hello' and '123qwa' from string.

My pseudo code is.

if /^VARHELLO/ exist
    get hello(or whatever comes after VARHELLO and before VARWELCOME)
if /^VARWELCOME/ exist
    get 123qwa(or whatever comes after VARWELCOME)

Note : values from 'VARHELLO' and 'VARWELCOME' are dynamic, so 'VARHELLO' could be 'H3Ll0' or VARWELCOME could be 'W3l60m3'.

Example: 
$string="VARHELLO=H3Ll0VARWELCOME=W3l60m3";

Answer 1

Here is some code that will parse this string out for you into a more usable array.

<?php
$string="VARHELLO=helloVARWELCOME=123qwa";
$parsed = [];
$parts = explode('VAR', $string);

foreach($parts AS $part){
   if(strlen($part)){
       $subParts = explode('=', $part);
       $parsed[$subParts[0]] = $subParts[1];
   }

}

var_dump($parsed);

Output:

array(2) {
  ["HELLO"]=>
  string(5) "hello"
  ["WELCOME"]=>
  string(6) "123qwa"
}

Or, an alternative using parse_str ( http://php.net/manual/en/function.parse-str.php )

<?php
$string="VARHELLO=helloVARWELCOME=123qwa";
$string = str_replace('VAR', '&', $string);

var_dump($string);
parse_str($string);

var_dump($HELLO);
var_dump($WELCOME);

Output:

string(27) "&HELLO=hello&WELCOME=123qwa"
string(5) "hello"
string(6) "123qwa"

Answer 2

Jessica's answer is perfect, but if you want to get it using preg_match

$string="VARHELLO=helloVARWELCOME=123qwa";

preg_match('/VARHELLO=(.*?)VARWELCOME=(.*)/is', $string, $m);

var_dump($m);

your results will be $m[1] and $m[2]

array(3) {
  [0]=>
    string(31) "VARHELLO=helloVARWELCOME=123qwa"
  [1]=>
    string(5) "hello"
  [2]=>
    string(6) "123qwa"

}