Human-format currency $'s converted to machine floating points

currency-to-float.php

<?php
/*
 * Human-format currency $'s converted to machine floating points
 */

// Dollar amount via GET (not very secure)
$raw_dollar_amount = ( isset($_GET['dollar_amount']) ) ? htmlentities( $_GET['dollar_amount'], ENT_QUOTES, 'UTF-8' ) : FALSE;
if ( $raw_dollar_amount ) {
    // Create a return value in case nothing done
    $float_dollar_amount = $raw_dollar_amount;
    
    // Build string of only the separators
    $separators_only = preg_filter( '/[^,\.]/i', '', $raw_dollar_amount );
    
    /*
     *
     * Check # of separators
     * If more than one, position determines region
     *
     * NOTE: Am assuming no separators in the decimal portion
     * 	That could be problem for complex #'s, but this isn't physics class after all
     * 	
     */
    if ( strlen( $separators_only ) > 1 ) {
	if ( substr( $separators_only, 0, 1) == '.' ) {
	    $float_dollar_amount = str_replace( '.', '', $float_dollar_amount );
	    $float_dollar_amount = str_replace( ',', '.', $float_dollar_amount );
	    
	} else if ( substr( $separators_only, 0, 1) == ',' ) {
	    $float_dollar_amount = str_replace( ',', '', $float_dollar_amount );
	}
	
    } else if ( strlen( $separators_only ) == 1 && $separators_only == ',' ) {
	/*
	 * Here's the crux assumption made for fule prices:
	 * 	That "4.99", "4.9999" or "4,999" is likely to be float "4.9{999}"
	 *
	 * Other option is to measure # digits after the separator
	 * ...but then we hit same problem as prev regex:
	 * 	http://www.php.net/manual/en/function.floatval.php#85346
	 *
	 */
	$float_dollar_amount = str_replace( ',', '.', $float_dollar_amount );
    }
    
    // Output trackers & processed value
    echo "<h2>Raw &amp; Filtered Values</h2>";
    echo "Float $-value: $float_dollar_amount<br /><br />";
    echo "Raw input $-value: $raw_dollar_amount<br />";
    echo "Separators from raw input: $separators_only<br /><br />";
}


// Input form
?>
<h2>Input a $-amount here</h2>
<form id="dollar_input" name="dollar_input" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
    <input type="text" name="dollar_amount" />
    <input type="submit" value="Submit" />
</form>

Mine mainly fixes your three decimal issue (4.039 stays a float), but only on the assumption that fuel prices will more frequently have three decimal places than their purchases reach thousands of dollars.

No worries either way, better use of time than flipping through Twitter links on the way home.

Yeah, if you're only parsing gas prices, you can make some assumptions. I'm also parsing things like mileage (54,678.9) and stuff though so I'm making my code a bit less strict.

Understood. I might have added different parsing code for each number type, but I saw your comment about 1,200 lines ... a lot for a plugin to track fuel & mileage.

I'm up past 1800 lines now. I expect to pass 2000 before the plugin gets released. Lots of fancy features. :)