[Resolved] is this possible in eval

[jansky]

to all guru

is this possible
if (($datasex=="F") || ($datasex=="M") )
{
$grabqry .=" (\"$datasex\"==\"$field->sex\" ) ";
}else
{
$grabqry .="";
}

if (eval($grabqry)) //<------ can this be done?? i got an error here
echo "yes";
else
echo "no";

[SBro]

Try this, eval() returns a null value:

if (is_null(eval($grabqry))) {
    echo "yes";
} else {
    echo "no";
}

[jansky]

well it wont work

the code tryin to evaluate as php the string in value $grabqry;

is there anywork around here

[SBro]

What won't work? what's the error you are getting.

[jansky]

Parse error: parse error in c:\inetpub\wwwroot\prog\eval.php(6) : eval()'d code on line 1

i created a sample code
$data="M";
$filed="M";
$value =" $data==$filed ";
//(eval(if('$value' ))) echo "yes"; else echo "no";
if (is_null(eval($value))) {
echo "yes";
} else {
echo "no";
}

the output should be YES

[SBro]

$data="M";
$filed="M";
$value = "\$data = \"$filed\";";
//(eval(if('$value' ))) echo "yes"; else echo "no";

if (is_null(eval($value))) {
	echo "yes";
} else {
	echo "no";
} 

[jansky]

well the code that you gave treat only as a value not evaluate as a php

the simpler code for this "and i want" is

$data="M";
$filed="M";
$value =" $data==$filed ";

basically we have if then else to compare two strings

eg: if ($data==$filed) echo "yes"; else echo "no";

now the comparison is in the variable $value which is ($value=" $data== $filed". Since the queries that im building is too big and there is a if then else . This if then else compose of many comparisons. the comparison coming from the table.

now I use eval to treat the variable $value not as a value but as a php

if (eval($value)) should be the same as if ($data==$filed)

[mtmosier]

eval doesn't work in a search and replace sort of way. You have to eval a complete snippet of code. You can't use the returned value directly.

$data="M";
$filed="M";

$value = '$result = $data == $filed;';
eval($value);
if ($result) {
    echo "yes";
} else {
    echo "no";
}

[mtmosier]

Bah, I should've read the manual first. You can treat eval'd code like a function, returning a value, in php4.

$data="M";
$filed="M";

$value = 'return $data == $filed;';
if (eval($value)) {
    echo "yes";
} else {
    echo "no";
}

[jansky]

ey this works

PERFECTTTTTTTTTTTTTTTT

thanks men