nntp.charter.net wrote:
I want to write a trace procedure and call it with variable names, and I am
having trouble with the syntax. My goal is to have a procedure that will
echo lines such as:
Trace: $myvar="the contents of $myvar
My attempt that didn't work is to write a function:
function my_trace($m){
echo ("\n<br>TRACE: $m = ");
eval("\$t=\"$m\";");
echo($t."<br>\n");
}
and call it with statements like:
my_trace("\$my_var");
my_trace("\$_ENV[\"COMPUTERNAME\"]");
What am I doing wrong, and how should this be done? Also, should I post to
a different group?
Thanks,
Gil Grodsky
ggrodsky@xxxxxxxxxxx
Try this script, it works for me:
$my_var = 'Hello world!';
function my_trace($m){ // pay attention to the use of single vs double quotes throughout
$q = substr($m, 1); // chop off the leading '$' in the variable name
@eval("global \${$q};"); // need to use global to get value of local variables into this function
// also need @ to supress warning caused by brackets in superglobal variables
eval("\$t = \${$q};"); // assign value of orginal $m to $t
echo ("<br />TRACE: $m = $t<br />"); // output
my_trace('$my_var'); // note the use of single quotes here
my_trace('$_ENV["COMPUTERNAME"]'); // note where the single quotes are used here
Hope it helps,
Bob
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