查找字符串中给定值出现的次数？

Question

Consider a string as below .

$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

I have to find out how many numbers are there within this string. But the number is equal to 1000 and above 1000 which proceed and followed by $ symbol .

Example : $1000 (or) $ 1000 (or) 1000$ (or) 1000 $ and above 1000 only .

Answer 1

Using preg_match_all() and a foreach loop:

$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 50000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

preg_match_all('/(\$\s?)(?P<before>\d{4,})|(?P<after>\d{4,})(\s?\$)/', $string, $m);

$tmp = array_filter($m["before"]) + array_filter($m["after"]);
$number = array();
foreach($tmp as $n){
    if($n >= 1000){
        if(isset($number[$n])){
            $number[$n]++;
        }else{
            $number[$n] = 1;
        }
    }
}

print_r($number);
// Key => number, value => n occurences

I've used \\d{4,} to match 4 digit numbers which are 1000 or higher, but say for example there is a number like 0500 , this will also be matched. So I used a foreach loop to filter the numbers.

Answer 2

<?php
$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";
$pattern = "#([$][\s]*)?([1-9]\d{3})([\s]*[$])?#";
//(?<=$|$\s)
//(?=$|\s$)
preg_match_all($pattern, $string, $out);
print_r($out[2]);

Array
(
    [0] => 1000
    [1] => 2000
    [2] => 1020
    [3] => 5000
    [4] => 2000
    [5] => 3000
)

Answer 3

Try this :

$string  ="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

preg_match_all('/\$\s?(?P<pr>\d{4,})|(?P<fl>\d{4,})\s?\$/',$string,$match);
$res     = array_merge(array_filter($match['pr']),array_filter($match['fl']));

echo "<pre>";
print_r($res);

Output :

Array
(
    [0] => 1000
    [1] => 2000
    [2] => 5000
    [3] => 1020
    [4] => 2000
    [5] => 3000
)