forms value and php echo stops after first space

The title is maby a bit strage, I had problem coming up with a title
that explain my problem.

I have a variable $myvar="TEST 123"

I would like to use this variable as a default value in a form. I have
tryed this code:

<input name="testbox1" type="text" value=<?php echo "$myvar"; ?>>
the result is a form with a textbox with the default value "TEST"

I have tryed

<input name="testbox2t" type="text" value=<?php echo "TEST 123"; ?>>
Same as before the default value is only "TEST"

But if I try

<input name="testbox 3t" type="text" value= "TEST 123t">
the default value is "TEST 123"

all my test code is inside the <form> </form> statement

[jan.hancic]

All text values must be inside " "
If the parser comes and sees this:

value=TEST 123

he will take TEST but he will think 123 is another attribute of the
tag.

The best way would be this:

<input name="textbox2" type="text" value="<?php echo $myvar ?>" />

[John Dunlop]

Somebody:

[$myvar='TEST 123';]

<input name="testbox1" type="text" value=<?php echo "$myvar"; ?>>
the result is a form with a textbox with the default value "TEST"

You are obviously aware that the value must be within quotes in the
HTML, but if you look at the HTML source you'll see the value is not
quoted, which causes the value to be cut off after 'TEST'. PHP
interprets what's after echo here as a string delimited by double quote
marks, that string being the variable $myvar, and only the value of
that string, not the quote marks as well, is echo-ed.

Two options. Either include the quotes in the echo-ed string (there
are various ways) or include them directly in the markup. Given the
advice to always quote attribute values, the latter seems more
appropriate.

--
Jock

Thanks to both of you. The solution was so obvious that I feel almost
like an idiot not seeing it myself.

[william.clarke]

If you had viewed the source from the browser you may have spotted what
it was doing, I find the old "View Source" option great for debugging
variable display code and other similar areas in my scripts.