删除货币符号 PHP

Question

I have a form with a jQuery slider allowing a price range to be selected.

The JavaScript that runs the slider also adds a prefix of the £ symbol to each price.

I am trying to remove the £ symbol before the form is submitted, as the price values in the database are only numeric without any currency symbol.

I am trying the str_replace function but the code below is not working?

<div id="slider">
    <input type="text" id="price-min" name="price-min" <?php 
        $price-min = str_replace('£', '', $price-min);
    ?>>
    </input>
    <input type="text" id="price-max" name="price-max" <?php 
        $price-max = str_replace('£', '', $price-max);
    ?>>
    </input>
</div>

Answer 1

You can just filter the variable.

<?php
$value = "£200";
echo filter_var($value, FILTER_SANITIZE_NUMBER_INT);

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Edit

I'll need to cover all values from £0 - £1,000 and also strip out the comma from the £1,000 figure - Is this possible?

<?php
$value = "£200";
echo filter_var( str_replace(",", "", $value), FILTER_SANITIZE_NUMBER_INT);

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Or even sanitize as a float

<?php
$value = "£1,200";
echo filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT);

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A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores

Your variables have - in them, making them invalid.

Edit 2

Removing the £ with javascript, use a regular expression.

var s = "£1,300";
s.replace(/\D/g,'');

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Edit 3

If you're accepting negative decimal numbers (ie: -£20,000.06/-£20000.06), then use the FILTER_FLAG_ALLOW_FRACTION flag. This issue was pointed out by Milan as the current answers didn't handle this test-case.

<?php
$value = "-£20,000.06";
echo filter_var($value, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION);

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Answer 2

Actually you can remove the pound sign after the form is submitted because php is a server side language. So either you remove it from the javascript slider so it won't be added to the value attribute or you use the function from hd.'s answer in the php script that the form points to.

Answer 3

To remove all characters, but numbers, dots and minus signs you should use:

$number = preg_replace('/[^0-9-.]+/', '', $string);

Once applied this function will return a numeric value, which can be correctly converted to float value. It will also keep the negative numbers intact, which is quite important. The other solutions presented here, convert them to positive numbers, which is incorrect and dangerous, if dealing with monetary values.

Answer 4

Currency symbols in HTML are HTML entities(I mean, frontend value) so using signs of currency directly to find and replace them is not possible, so using as below to get only digit in PHP.

$price = '$109.99';
$digitOnly = preg_replace('/&.*?;/', '', $price);