I make this observation: memcache PHP // why this???

General PHP Help
#1

I make this observation: // why this???
echomc(); // this give error … if commented and uncomment next line Not error
//echo memcache_get($memcache_obj, ‘var_key’);

Warning: memcache_get() expects parameter 1 to be MemcachePool, null given in /var/sites/b/xyz.com/public_html/xyz.php on line 45

[php]/* procedural API */

/* connect to memcached server */
$memcache_obj = memcache_connect(‘x.y.z.f’, 11211);

/*
set value of item with key ‘var_key’
using 0 as flag value, compression is not used
expire time is 30 seconds
*/

memcache_set($memcache_obj, ‘var_key’, ‘some variable’, 0, 30);

function echomc() {
echo memcache_get($memcache_obj, ‘var_key’); // line 45
}

echomc(); // this give error … if commented and uncomment next line Not error
//echo memcache_get($memcache_obj, ‘var_key’);[/php]

#2

You cannot access arbitrary variables from within a function. If you want to use the Memcached connection in the function, pass it to a parameter:

The function declaration
[php]function echo_memcache_value($connection, $key)
{
echo memcache_get($connection, $key);
}
[/php]

The function call
[php]<?php

echo_memcache_value($memcache_obj, ‘var_key’);
[/php]

For the record: It’s theoretically possible to import global variables with the [tt]global[/tt] keyword, but this is confusing and should be avoided at all cost. Use parameters.

#3

[php] $memcache_obj = memcache_connect(‘x.y.z.f’, 11211);
[/php]

OK, btw this^ can called inside each function, otherwise, but also to point to same memcache?

#4

Not sure if I understand your question. You want to call [tt]memcache_connect()[/tt] in the function? This would be extremely inefficient, because you’d establish a new connection on each function call. It’s also unnecessary code duplication. So, no, that’s not an option.

What’s wrong with parameters?

#5

yes that mean

if have
set

get

delete

call inside each - at least for debugging or testing server is OK? - >>>
[php]$memcache_obj = memcache_connect(‘x.y.z.f’, 11211);

memcache_set($memcache_obj, ‘var_key’, ‘some variable’, 0, 30);

function echomc() {
$memcache_obj = memcache_connect(‘x.y.z.f’, 11211);
echo memcache_get($memcache_obj, ‘var_key’); // line 45
}[/php]

#6

Why would you do that? This makes absolutely no sense to me.

#7

At least in testing server is OK…?

#8

Again: What you’re doing makes no sense to me, neither in production nor for testing nor for anything else.

If you insist on doing it, go ahead. I can’t stop you. But I won’t tell you that it’s OK, because I see no reason to make that statement.

#9

if in production using apc cache and in development memcache - I want not modify first functions - just create fwd…functions…

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