Php: Do Arrays Have a Maximum Size

Array size limit in PHP

You could be running out of memory, as your array size is (in theory) only limited by the amount of memory allocated to the script.
Put ini_set('memory_limit', '1024M'); in the beginning of your script to set the memory limit to 1 GB. You may need to increase this even higher for best results.

how long array we can use in php

There is no limit of an array (maximum) you can store as you can but there is a limit on your script.

You can change the script memory limit by using memory_limit in your php.ini file.

When you get the error "Out of memory" than you need to modified your script memory as i mentioned above memory_limit .

One last thing, sometime you didn't have access to modify your php.ini than you can also use like this in your php file.

ini_set('memory_limit','128M'); // or something larger

Side Note:

If you change memory_limit from php.ini file, than you must need to restart APACHE.

Maximum number of dimensions in a PHP array

Each array level generally costs you 304 bytes (determined by checking memory usage, creating an array, then checking again), and the total amount of memory can be calculated using ini_get("memory_limit"). To get the current usage, run memory_get_usage().

On my computer:

• ini_get("memory_limit") returns "128M", or 134217728 bytes.
• memory_get_usage() base use is 627120

so I would expect the limit on my kit to be 439442 depth

Is there a maximum size of return values in SOAP/PHP?

The default amount of memory that PHP allows a script to allocate is 128 MB, and this includes variables such as arrays.

This 128 MB limit can be overridden globally by changing the memory_limit option in the php.ini. Changing the setting to -1 means "unlimited".

It can also be overridden on a per script basis by using the ini_set function:

ini_set('memory_limit', '-1'); // Unlimited RAM

When "unlimited" is used, the size of your array is determined by the amount of available RAM on your machine.

Limit array to 5 items

First of all i think, you need to obtain array length , then if length > or equal to 5, remove first element , and add element to the end of array.

if (!in_array($articleid, $lastviewedarticles)){
    $count = count($lastviewedarticles);
    if($count>=5)
        array_shift($lastviewedarticles);
    $lastviewedarticles[] = $articleid;
}

Max Size of value in an array PHP

You might need to read up on the length of the max concat here.

Command-Line Format        --group_concat_max_len=#
Option-File Format         group_concat_max_len
Option Sets Variable       Yes, group_concat_max_len
Variable Name              group_concat_max_len
Variable Scope  Global, Session

Dynamic Variable           Yes
  -- Permitted Values
Platform Bit Size          32
Type                       numeric
Default                    1024
Range                      4 .. 4294967295

  -- Permitted Values
Platform Bit Size          64
Type                       numeric
Default                    1024
Range                      4 .. 18446744073709547520

Edit: I find it rather amusing that the string that is returned to you is 1024 in length - which just happens to be the default max length in mysql. Coincedence?

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