Getting a PHP constant back from it's string name

I'm creating a small LDAP connection class but this applies to PHP constants in general.

PHP has constants like LDAP_OPT_PROTOCOL_VERSION, LDAP_OPT_HOST_NAM, and LDAP_OPT_TIMELIMIT that are used in the following function:

ldap_set_option ( $myLdapConnection, LDAP_OPT_PROTOCOL_VERSION, 3 )

In my LDAP connection class I want to be able to pass the options in an array like so

array( 
'LDAP_OPT_PROTOCOL_VERSION' => 3,
'LDAP_OPT_TIMELIMIT' => 1000
);

I'd then like to do the following type of loop

foreach( $options as $option => $value ){
      ldap_set_option ( $myLdapConnection, $option, $value );
}

If I try this, however, I get an error that says the function expects a long, not a string. How can I get past this?

EDIT: Bart is right, I realize. I'll do it this way. It'll even be faster because there开发者_开发问答 won't be a string involved.

Just to be clear though, if ever there should be overlap of constants, for example when I define my own constants, then it might be a problem.

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You can use constant($option)

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Why not build your array like this:

array( 
    LDAP_OPT_PROTOCOL_VERSION => 3,
    LDAP_OPT_TIMELIMIT => 1000
);

Also keeps it working if for whatever reason PHP changes (new PHP release for example) the values of any of the constants you use.

---

You can create your array so that you're storing the actual constant, and not the string representation of the constant. Like so:

array( 
LDAP_OPT_PROTOCOL_VERSION => 3,
LDAP_OPT_TIMELIMIT => 1000
);

Keep in mind that this only works so long as there's no overlap in the values of the actual constants; that would cause a collision in your array space.