PHP - Check If A String Has Invalid Characters

I have a text firld to enter amount af a book,But i need to check whether the data entering is numeric only eg:70.98 etc.
how can i achieve this.

my code is
echo"<table><tr><td></td><td>Amount  in USD</td><td></td><td><input type='text' name='amnt' id='amnt'  /> </td><td></td></tr></table>";

Does anybody know of a function or a way of letting me get the string between whatever characters? Say I had [SOMEWORD] text [SOMEWORD] then how could I go about getting the value "text", please note I'm not trying to make bbcode or similar.

This topic has been moved to PHP Regex.

http://www.phpfreaks.com/forums/index.php?topic=313299.0

Hello Everyone,

I am working on a project I pull the field names from the database. I am trying to remove the underscore (_) when the field name is displayed. Does anyone know how I would do that?

Here is the code that I am working with
Code: [Select]
$i = 0;
    while ($i < mysql_num_fields($fieldnamesquery_result)) {
        $meta = mysql_fetch_field($fieldnamesquery_result, $i);
        if (!$meta) {
            echo "No information available";
        }

        $meta = str_replace("_", " ", $meta);

        $tablecolumn .= "<p>" . $meta->name . ":<input type='text' name='" . $meta->name . "' id='" . $meta->name . "' /></p>";
        $i++;

Hi, I am trying to search a string for a string of characters in this order ../ and carry out relevant if statements but it returns the same result every time. On echoing my $pos, $pos2, $pos3 and $pos4 variables the first two come back 0 and they are the strings that do contain ../ but the if statements perform the same? I don't understand, any ideas? Thanks...

Code: [Select]
<?php $logo = $info ['logo'];
$pos = strpos($logo, "../");//check if image contains ../
if ($pos == 0) {}
else {
$logo = substr($logo, 3);}

$image1 = $info ['image1'];
$pos1 = strpos($image1, "../");//check if image contains ../
if ($pos1 == 0) {}
else {
$image1 = substr($image1, 3);}

$image2 = $info ['image2'];
$pos2 = strpos($image2, "../");//check if image contains ../
if ($pos2 == 0) {}
else {
$image2 = substr($image2, 3);}

$image3 = $info ['image3'];
$pos3 = strpos($image3, "../"); //check if image contains ../
if ($pos3 == 0) {}
else {
$image3 = substr($image3, 3);}

?>

How I can explode by a series of characters (not one single character)? For example, divide the string to an array by any of these characters "," and ";" and "."

$string = "this, that;some.word;second";

I want to put all of these words into an array.

Am looking forward to removing all the numeric characters upto and including the leading "/" in

90/_featuredarticles/2011/12

Regards

Hi Guys

What code would you use to check that a form field does not exceed 100 characters? 

Thanks for any help.

Hi

I am trying to replace characters in a string with images so character 'a' will be replaced with a.jpg etc  I have tried the following code but that doesn't result in the desired effect as the updated string gets it's characters replaced as the script works through it so the 'img' in the first updated string gets replaced with with images and it all ends up quite a mess.  Is there a simpler way to do this?

$content = "abc" ;
$content = str_replace("a", "<img src=images/a.jpg >", $content);
$content = str_replace("b", "<img src=images/b.jpg >", $content);
$content = str_replace("c", "<img src=images/c.jpg >", $content);
$content = str_replace("d", "<img src=images/d.jpg >", $content);
$content = str_replace("e", "<img src=images/e.jpg >", $content);
$content = str_replace("f", "<img src=images/f.jpg >", $content);
$content = str_replace("g", "<img src=images/g.jpg >", $content);
$content = str_replace("h", "<img src=images/h.jpg >", $content);
$content = str_replace("i", "<img src=images/i.jpg >", $content);
$content = str_replace("j", "<img src=images/j.jpg >", $content);
$content = str_replace("k", "<img src=images/k.jpg >", $content);
$content = str_replace("l", "<img src=images/l.jpg >", $content);
$content = str_replace("m", "<img src=images/m.jpg >", $content);
$content = str_replace("n", "<img src=images/n.jpg >", $content);
$content = str_replace("o", "<img src=images/o.jpg >", $content);
$content = str_replace("p", "<img src=images/p.jpg >", $content);
$content = str_replace("q", "<img src=images/q.jpg >", $content);
$content = str_replace("r", "<img src=images/r.jpg >", $content);
$content = str_replace("s", "<img src=images/s.jpg >", $content);
$content = str_replace("t", "<img src=images/t.jpg >", $content);
$content = str_replace("u", "<img src=images/u.jpg >", $content);
$content = str_replace("v", "<img src=images/v.jpg >", $content);
$content = str_replace("w", "<img src=images/w.jpg >", $content);
$content = str_replace("x", "<img src=images/x.jpg >", $content);
$content = str_replace("y", "<img src=images/y.jpg >", $content);
$content = str_replace("z", "<img src=images/z.jpg >", $content);


echo $content ;

Any help would be gratefully appreciated.

Thanks
Megalos (paul)

This topic has been moved to PHP Regex.

http://www.phpfreaks.com/forums/index.php?topic=320682.0

I have a large amount of text, (text can be different at any time), I count the number of characters in the string,and divide it by 2 so that half of the text will be in one variable, the other half in the other, however I am not sure how to get the split function, or whichever function to split it by the number of characters.

example:


$text = "lorem ispum dolar sit amet, consecterur adiscing elit. Donec dictum placerat sapien, in eliefend liber";
$cut = strlen($text)/2;
//(here's where i cannot get it to work/do not know which function to use and how to use it)
//but what I want it to do is to split it half way.

Hi,

Im looking at using a statement like this to remove all text characters from a string.

  $outgoing = substr_replace($incoming,"",-1); 

The string is a currency that has a currency symbol in the beginning of the string, like "R500.00"

I would like to remove the R, so it is just a numeric value...

Please can you help me with any ideas on how to get this going? Been reading so much and its all confused me too badly.

Regards,
Chris

In <div id="chart_rt">%3$s</div> below, it is populated with a string that always begins with a number followed by a colon (from 1: to 25:). I see that ltrim removes characters from the beginning of a string but I don't see how to compensate for the extra character in 10: through 25:


function wp_rss( $url, $num_items = -1 ) {
    if ( $rss = fetch_rss( $url ) ) {
        echo '<div id="charts">';

        if ( $num_items !== -1 ) {
            $rss->items = array_slice( $rss->items, 0, $num_items );
        }
//start count
$i = 1;
        foreach ( (array) $rss->items as $item ) {
            printf(
                '<div id="chart_lt">'.$i.'</div><div id="chart_rt">%3$s</div>',
                esc_url( $item['link'] ),
                esc_attr( strip_tags( $item['description'] ) ),
                htmlentities( $item['title'] )
            );
//increment
$i++;
        }

        echo '</div>';
    } else {
        _e( 'An error has occurred, which probably means the feed is down. Try again later.' );
    }
}

I have a variable called $content and I want it to stop execution at 25 characters... How can this be accomplished? Thanks in advance.

I have sen this function before but can not remember what it is or how to code it. It allows you remove only defined characters from the end of the string. I am not looking to replace any occurrence anywhere in the phrase, just the end.

For example lets say I want to remove"ld!" from phrase "Hello World!" That function would return "Hello Wor"

Thanks