str_replace problem

[master82]

In my table i have the field 'field1' and an example of its data is below:
[code]
((F*0.8)/1)+(L/4)
[/code]

Its simply a small calculation, which uses the following code:
[code]
$calc="\$rate=".str_replace(array("L","E","F","I"), array($l, $e, $f, $I),$field1).";";
eval($calc);
[/code]

When the code is run I get the following error:
[quote]
Parse error: parse error, unexpected ';' in LOCATION\PAGE.php(60) : eval()'d code on line 1
[/quote]

Any idea what it is i'm doing wrong?

Also Im using $rate later on in the page - will there be a problem with this?

[Jenk]

[code]<?php

$calc="\$rate=".str_replace(array("L","E","F","I"), array('$l', '$e', '$f', '$I'),$field1).";";
eval($calc);

?>[/code]

[master82]

I added the ' ' around the 4 variables but still got the same error message

[Jenk]

change the eval to echo, what do you get?

[master82]

$rate=;

[Jenk]

in that case: $field1 == ('' || null);

you need to look at where $field1 is declared and defined.

[wildteen88]

Use
[code=php:0]$calc = "\$rate = str_replace(array(\"L\",\"E\",\"F\",\"I\"), array(\$l, \$e, \$f, \$I), \$field1);";[/code]

If you are using eval.

However i see no use for eval here. Just use:
[code=php:0]$rate = str_replace(array("L","E","F","I"), array($l, $e, $f, $I), $field1);[/code]

[master82]

Sorry - just realised I mispelt the field - hence no value!

Thanks for your time guys!

[master82]

Its always the simple things... lol

[Jenk]

[quote author=wildteen88 link=topic=106833.msg427692#msg427692 date=1157372216]
Use
[code=php:0]$calc = "\$rate = str_replace(array(\"L\",\"E\",\"F\",\"I\"), array(\$l, \$e, \$f, \$I), \$field1);";[/code]

If you are using eval.

However i see no use for eval here. Just use:
[code=php:0]$rate = str_replace(array("L","E","F","I"), array($l, $e, $f, $I), $field1);[/code]
[/quote]it appears that $field1 contains an equation, the OP is trying to replace Keywords with values, and then execute the equation. eval() will be needed if the OP wants that equation to execute in PHP :)

[wildteen88]

Oh i see. Didnt realise that. Thanx for the heqads up.