Data type

@PittsburghRedMar 21.2004

I am writing a questionaire in PHP whose responses will be “numbers” from 1 to 8. The HTML form will pass these responses to the PHP program as text, the pair values being the numbers of the items and corresponding user responses (1 to 8). How can these text values be converted to numeric values so that arithmetic can be performed? The book I am using to investigate PHP does not cover this topic. I am familiar with how this is accomplished in other programming languages.Thank you.

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PHP

@pyroMar 21.2004 — #PHP does not require you to set the type definition in your variables declaration. The type is determined by the variables use. Take this example:

[code=php]$foo = 5; # $foo is cast as an integer
 $bar = "5"; # $bar is cast as an string
 $bar = $foo + $bar; # $bar is now an integer, due to the addition[/code]

See http://us4.php.net/language.types.type-juggling for more information on this.

@PittsburghRedauthorMar 22.2004 — #Thank you Pyro. I understand. I did not provide a variable to cast. I wrote:

print "<H3>The sum is $n01+$n02+$n03</H3>";

which printed the exact line between quotes. When I switched to:

$sum=$n01+$n02+$n03;

print "<H3>The sum is $sum.</H3>";

The actual numeric sum of the values was printed out.

@pyroMar 22.2004 — #The first example didn't work because you were using PHP's variable interpolation, which will not add the variables but rather output something like this (assuming your variables values were 1, 2, and 3, repectively):

The sum is 1+2+3

This, however, would output the desired result:

[code=php]print "<H3>The sum is ".$n01+$n02+$n03."</H3>";[/code]

@PittsburghRedauthorMar 22.2004 — #The first example didn't work because you were using PHP's variable interpolation, which will not add the variables but rather output something like this (assuming your variables values were 1, 2, and 3, repectively):

The sum is 1+2+3

No, it printed the identifiers (var names) ... not the indicated sum of the values stored in the vars.

The syntax you indicate below is most interesting. I did not see this in my book. I will try it.

This, however, would output the desired result:

PHP:
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print "<H3>The sum is ".$n01+$n02+$n03."</H3>";

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