String replace help

[susan0nz]

I have some strings like this: "The temperature is 18 Celsius today".
Some strings may have more than one value in them, like "The
temperature is 18 Celsius today. Yesterday is was 17 Celsius".

I want to display these, adding a tooltip when the mouse pointer is
over the "18C section, such that it shows the value in Fahrenheit
instead of Celsius. Something like this:

The temperature is <span class="temp" title="64 Fahrenheit">18
Celsius</span> today.

I need some way to do a string replace to add the <span>, but with a
calculation to work out the new value. Can preg_replace do something
like this?

[Erwin Moller]

su******@yahoo.co.uk wrote:

I have some strings like this: "The temperature is 18 Celsius today".
Some strings may have more than one value in them, like "The
temperature is 18 Celsius today. Yesterday is was 17 Celsius".

I want to display these, adding a tooltip when the mouse pointer is
over the "18C section, such that it shows the value in Fahrenheit
instead of Celsius. Something like this:

The temperature is <span class="temp" title="64 Fahrenheit">18
Celsius</span> today.

I need some way to do a string replace to add the <span>, but with a
calculation to work out the new value. Can preg_replace do something
like this?

Hi

I am unsure how to manage that with preg_replace. Probably it is possible.
But you can easily code it yourself like this:

$temp = "The temperature is 18 Celsius today. Yesterday is was 17 Celsius";
$words = explode(" ",$temp);

// you now have a array with all the words.
// loop through all:
for($i=0;$i<count($words);$i++){
// is it a number?
if (is_numeric($words[$i])){
$fahrenheit = $words[$i] * blabla;
// (I don't know the conversion)
echo " <span class='temp' title='".$fahrenheit." Fahrenheit'>";
echo $words[$i].$words[$i+1]."</span> ";
$i++;
} else {
echo $words[$i]." ";
}
}
Watch the lines:
echo " <span class='temp' title='".$fahrenheit." Fahrenheit'>";
echo $words[$i].$words[$i+1]."</span> ";
$i++;

In there I also include the next word (Celsius), and also must increase the
counter $i by 1 extra. If not done, you will see Celsius 2 times.
But if your sentence end with a number this gives an array out of bound
error.

I didn't check this code, but I guess you will manage from here.
Good luck.

Regards,
Erwin Moller

[Markus Ernst]

Erwin Moller wrote:

$temp = "The temperature is 18 Celsius today. Yesterday is was 17
Celsius"; $words = explode(" ",$temp);

// you now have a array with all the words.
// loop through all:
for($i=0;$i<count($words);$i++){
// is it a number?
if (is_numeric($words[$i])){
$fahrenheit = $words[$i] * blabla;
// (I don't know the conversion)
echo " <span class='temp' title='".$fahrenheit." Fahrenheit'>";
echo $words[$i].$words[$i+1]."</span> ";
$i++;
} else {
echo $words[$i]." ";
}
}

I like your idea. Anyway you get a problem with:

$temp = "My 11 year old daughter said, the temperature was 18 Celsius, but
it was actually 17 Celsius."

As a modification suggestion:

$words = explode(" ", $temp);
for ($i=0; $i<count($words); $i++) {
// Check for "Celsius"
// I use strstr because there could be a punctuation or something
if (strstr($words[$i], "Celsius")) {
if (is_numeric($words[$i-1])) {
$celsius = $words[$i-1];
$fahrenheit = $celsius * blabla;
$words[$i-1] = "<span class='temp' title='".$fahrenheit."
Fahrenheit'>".$celsius;
$words[$i] = str_replace("Celsius", "Fahrenheit",
$words[$i])."</span>";
}
}
}
echo implode(" ", $words);

Not tested, but shows the idea.

HTH
Markus

[Erwin Moller]

Yes Markus.
Better. :-)

Suzan?
Will this help you enough?

Regards,
Erwin

[Michael Fesser]

.oO(su******@yahoo.co.uk)

I have some strings like this: "The temperature is 18 Celsius today".
Some strings may have more than one value in them, like "The
temperature is 18 Celsius today. Yesterday is was 17 Celsius".

I want to display these, adding a tooltip when the mouse pointer is
over the "18C section, such that it shows the value in Fahrenheit
instead of Celsius. Something like this:

The temperature is <span class="temp" title="64 Fahrenheit">18
Celsius</span> today.

I need some way to do a string replace to add the <span>, but with a
calculation to work out the new value. Can preg_replace do something
like this?

Yep, with the modifier /e which interprets the replacement string as PHP
code.

function C2F($temp) {
return ($temp + 32) * 1.8;
}

$pattern = '#((\d+)\s*celsius)#ei';
$replace = 'sprintf("<span class=\"temp\" title=\"%.1f°F\">$1</span>", C2F($2))';
$text = preg_replace($pattern, $replace, $text);

If you want a longer title, use this instead:

$replace = 'sprintf("<span class=\"temp\" title=\"%.1f Fahrenheit\">$1</span>", C2F($2))';

HTH
Micha

[susan0nz]

Erwin Moller wrote:

Yes Markus.
Better. :-)

Suzan?
Will this help you enough?

I went with the method suggested by Michael Fesser, but thanks to
everyone for the other suggestions.