I have a php program that calls a shell script, this part works fine and most of the commands work. However, I have a cpio command in the shell script, and for some reason this doesn't work. If I catch the return code, it's 1 which means it terminated with an error, but I get no other indication of... (3 Replies)
I have a ksh script that connects to sqlplus and dumps the query results into a file. The script works file when I run it from the command line, however, when I call it from PHP using system(), exec(), or shell_exec() commands, the script doesn't seem to run the query. It will create the text file... (7 Replies)
I new to unix and I'm using a HP UX and I'm logging in as user: root. I wish to create new users by using the 'useradd' command.
When I keyed in' useradd -u 101 -g group john', the reply was 'Group group specified with -g does not exist'.
I've read the man page on useradd and I still don't... (8 Replies)
Hello all!
This is my first post and I'm very new to programming. I would like help creating a simple perl or bash script that I will be using in my work as a junior bioinformatician.
Essentially, I would like to take a tab-delimted or .csv text with 3 columns and write them to a "3D" matrix:
... (16 Replies)
Hi guys,
I've a simple linux script (made by my friend), which adds users to the system from userlist file. it also creates user home dir and copies certain files to the directory. To be honest, am a newbie in scripting so am unable to fully understand how the script is working. unfortunately,... (30 Replies)
hi,
i am new to shell scripts
i write a shell script to create multiple users but i need to give passwords to that users while creating users, command to write this script (1 Reply)
Hello, I am new to Ubuntu Server.
Can you please suggest very simple configuration to network.
Need:
1. Ubuntu Server (already installed)
2. Connect to it 1 Linux Mint computer (already installed) + 1 computer with Windows 7 (already installed).
Need to create 3 groups with... (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Send a fortune to all active/logged in users
2. Relevant commands, code, scripts, algorithms:
So I understand... (8 Replies)
Discussion started by: kjcraig77
8 Replies
LEARN ABOUT PHP
eval
EVAL(3) 1 EVAL(3)eval - Evaluate a string as PHP codeSYNOPSIS
mixed eval (string $code)
DESCRIPTION
Evaluates the given $code as PHP.
Caution
The eval(3) language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged.
If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user
provided data into it without properly validating it beforehand.
PARAMETERS
o $code
- Valid PHP code to be evaluated. The code mustn't be wrapped in opening and closing PHP tags, i.e. 'echo "Hi!";' must be passed
instead of '<? echo "Hi!"; >'. It is still possible to leave and reenter PHP mode though using the appropriate PHP tags, e.g.
'echo "In PHP mode!"; ?>In HTML mode!<? echo "Back in PHP mode!";'. Apart from that the passed code must be valid PHP. This
includes that all statements must be properly terminated using a semicolon. 'echo "Hi!"' for example will cause a parse error,
whereas 'echo "Hi!";' will work. A return statement will immediately terminate the evaluation of the code. The code will be exe-
cuted in the scope of the code calling eval(3). Thus any variables defined or changed in the eval(3) call will remain visible
after it terminates.
RETURN VALUES eval(3) returns NULL unless return is called in the evaluated code, in which case the value passed to return is returned. If there is a
parse error in the evaluated code, eval(3) returns FALSE and execution of the following code continues normally. It is not possible to
catch a parse error in eval(3) using set_error_handler(3).
EXAMPLES
Example #1
eval(3) example - simple text merge
<?php
$string = 'cup';
$name = 'coffee';
$str = 'This is a $string with my $name in it.';
echo $str. "
";
eval("$str = "$str";");
echo $str. "
";
?>
The above example will output:
This is a $string with my $name in it.
This is a cup with my coffee in it.
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Tip
As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of
this function, and save it in a string (for example).
Note
In case of a fatal error in the evaluated code, the whole script exits.
SEE ALSO call_user_func(3).
PHP Documentation Group EVAL(3)