Extract a single (unsigned) integer from a string
PhpStringIntegerText ExtractionPhp Problem Overview
I want to extract the digits from a string that contains numbers and letters like:
"In My Cart : 11 items"
I want to extract the number 11.
Php Solutions
Solution 1 - Php
If you just want to filter everything other than the numbers out, the easiest is to use filter_var:
$str = 'In My Cart : 11 items';
$int = (int) filter_var($str, FILTER_SANITIZE_NUMBER_INT);
Solution 2 - Php
$str = 'In My Cart : 11 12 items';
preg_match_all('!\d+!', $str, $matches);
print_r($matches);
Solution 3 - Php
preg_replace('/[^0-9]/', '', $string);
This should do better job!...
Solution 4 - Php
Using preg_replace:
$str = '(111) 111-1111';
$str = preg_replace('/\D/', '', $str);
echo $str;
Output: 1111111111
Solution 5 - Php
For floating numbers,
preg_match_all('!\d+\.?\d+!', $string ,$match);
Thanks for pointing out the mistake. @mickmackusa
Solution 6 - Php
I do not own the credit for this, but I just have to share it. This regex will get numbers from a string, including decimal points/places, as well as commas:
/((?:[0-9]+,)*[0-9]+(?:\.[0-9]+)?)/
Cited from here:
https://stackoverflow.com/questions/14482022/php-regex-how-to-extract-a-number-with-decimal-dot-and-comma-from-a-string#answer-14482071
Solution 7 - Php
You can use preg_match:
$s = "In My Cart : 11 items";
preg_match("|\d+|", $s, $m);
var_dump($m);
Solution 8 - Php
Using preg_replace
$str = 'In My Cart : 11 12 items';
$str = preg_replace('/\D/', '', $str);
echo $str;
Solution 9 - Php
$value = '25%';
Or
$value = '25.025$';
Or
$value = 'I am numeric 25';
$onlyNumeric = filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
This will return only the numeric value
Solution 10 - Php
You can use following function:
function extract_numbers($string)
{
preg_match_all('/([\d]+)/', $string, $match);
return $match[0];
}
Solution 11 - Php
The top resource-friendly solutions
<?php
var $string = "In My Cart : 11 items";
?>
1. Fastest: filter_var — Filters a variable with a specified filter
<?php
filter_var($string, FILTER_SANITIZE_NUMBER_INT); // string(2) "11"
?>
2. Almost the fastest: str_replace — Replace all occurrences of the search string with the replacement string
<?php
str_replace(array('In My Cart : ',' item', 's'),"", $string); // string(2) "11"
?>
3. Fast enough: preg_replace — Perform a regular expression search and replace
<?php
preg_replace("/[^0-9]/","",$string); // string(2) "11"
?>
However
-
the simplicity of
str_replacecause speed, but even limited use cases -
preg_replaceis much more versatile thanstr_replaceorfilter_var -
instead is possible to use a function to specify what to replace using
preg_replace_callback -
with
preg_replace_callbackcan do multiple replacements in one call -
filter_varlimited in sanitation options
Solution 12 - Php
preg_match_all('!\d+!', $some_string, $matches);
$string_of_numbers = implode(' ', $matches[0]);
The first argument in implode in this specific case says "separate each element in matches[0] with a single space." Implode will not put a space (or whatever your first argument is) before the first number or after the last number.
Something else to note is $matches[0] is where the array of matches (that match this regular expression) found are stored.
For further clarification on what the other indexes in the array are for see: http://php.net/manual/en/function.preg-match-all.php
Solution 13 - Php
try this,use preg_replace
$string = "Hello! 123 test this? 456. done? 100%";
$int = intval(preg_replace('/[^0-9]+/', '', $string), 10);
echo $int;
Solution 14 - Php
we can extract int from it like
$string = 'In My Car_Price : 50660.00';
echo intval(preg_replace('/[^0-9.]/','',$string)); # without number format output: 50660
echo number_format(intval(preg_replace('/[^0-9.]/','',$string))); # with number format output :50,660
demo : http://sandbox.onlinephpfunctions.com/code/82d58b5983e85a0022a99882c7d0de90825aa398
Solution 15 - Php
Follow this step it will convert string to number
$value = '$0025.123';
$onlyNumeric = filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);
settype($onlyNumeric,"float");
$result=($onlyNumeric+100);
echo $result;
Another way to do it :
$res = preg_replace("/[^0-9.]/", "", "$15645623.095605659");
Solution 16 - Php
Since there is only 1 numeric value to isolate in your string, I would endorse and personally use filter_var() with FILTER_SANITIZE_NUMBER_INT.
echo filter_var($string, FILTER_SANITIZE_NUMBER_INT);
A whackier technique which works because there is only 1 numeric value AND the only characters that come before the integer are alphanumeric, colon, or spaces is to use ltrim() with a character mask then cast the remaining string as an integer.
$string = "In My Cart : 11 items";
echo (int)ltrim($string, 'A..z: ');
// 11
If for some reason there was more than one integer value and you wanted to grab the first one, then regex would be a direct technique.
echo preg_match('/\d+/', $string, $m) ? $m[0] : '';
sscanf() is rather handy if you need to explicitly cast the numeric string as an integer (or float). If it is possible/unknown for the integer value to occur at the start of the string, then prepend a non-numeric character to the input string before scanning it. The following technique matches leading non-digits (and ignores them with * after the %), then matches the first occurring sequence of digits and casts the returned substring as an integer.
var_dump(sscanf(' ' . $string, '%*[^0-9]%d')[0]);
To adapt this technique to extract a float value, just change the d to f. For more information on the (currently undocumented) assignment suppression feature of sscanf(), see this post.
Solution 17 - Php
other way(unicode string even):
$res = array();
$str = 'test 1234 555 2.7 string ..... 2.2 3.3';
$str = preg_replace("/[^0-9\.]/", " ", $str);
$str = trim(preg_replace('/\s+/u', ' ', $str));
$arr = explode(' ', $str);
for ($i = 0; $i < count($arr); $i++) {
if (is_numeric($arr[$i])) {
$res[] = $arr[$i];
}
}
print_r($res); //Array ( [0] => 1234 [1] => 555 [2] => 2.7 [3] => 2.2 [4] => 3.3 )
Solution 18 - Php
An alternative solution with sscanf:
$str = "In My Cart : 11 items";
list($count) = sscanf($str, 'In My Cart : %s items');
Solution 19 - Php
Depending on your use case, this might also be an option:
$str = 'In My Cart : 11 items';
$num = '';
for ($i = 0; $i < strlen($str); $i++) {
if (is_numeric($str[$i])) {
$num .= $str[$i];
}
}
echo $num; // 11
Though I'd agree a regex or filter_var() would be more useful in the stated case.
Solution 20 - Php
for utf8 str:
function unicodeStrDigits($str) {
$arr = array();
$sub = '';
for ($i = 0; $i < strlen($str); $i++) {
if (is_numeric($str[$i])) {
$sub .= $str[$i];
continue;
} else {
if ($sub) {
array_push($arr, $sub);
$sub = '';
}
}
}
if ($sub) {
array_push($arr, $sub);
}
return $arr;
}
Solution 21 - Php
> If you don't know which format the number is? int or floating, then use this :
$string = '$125.22';
$string2 = '$125';
preg_match_all('/(\d+.?\d+)/',$string,$matches); // $matches[1] = 125.22
preg_match_all('/(\d+.?\d+)/',$string2,$matches); // $matches[1] = 125
Solution 22 - Php
This functions will also handle the floating numbers
$str = "Doughnuts, 4; doughnuts holes, 0.08; glue, 3.4";
$str = preg_replace('/[^0-9\.]/','-', $str);
$str = preg_replace('/(\-+)(\.\.+)/','-', $str);
$str = trim($str, '-');
$arr = explode('-', $str);
Solution 23 - Php
This script creates a file at first , write numbers to a line and changes to a next line if gets a character other than number. At last, again it sorts out the numbers to a list.
string1 = "hello my name 12 is after 198765436281094and14 and 124de"
f= open("created_file.txt","w+")
for a in string1:
if a in ['1','2','3','4','5','6','7','8','9','0']:
f.write(a)
else:
f.write("\n" +a+ "\n")
f.close()
#desired_numbers=[x for x in open("created_file.txt")]
#print(desired_numbers)
k=open("created_file.txt","r")
desired_numbers=[]
for x in k:
l=x.rstrip()
print(len(l))
if len(l)==15:
desired_numbers.append(l)
#desired_numbers=[x for x in k if len(x)==16]
print(desired_numbers)