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17 useful functions for manipulating arrays in PHP

The table is also available in downloadable PDF:
http://techrepublic.com.com/5138-3513-5792845.html

Of the over 60 PHP array functions, this document has listed only 17. Which functions would you include in the next version of this table?

I have the following arrays:

volume_array=(100,200,350,400); and
height_array=(1,5,8,10);

a height_array value corresponds to a value in the volume_array with the same key.

Does someone know how to efficiently get the corresponding volume for a height of 7 assuming a linear relationship?

I have been looking at the php array functions for sometime now without any luck.

First, my apologies for the lenght of this message. I have the following array which includes a Twitter direct message that i pulled with this method: [code] $direct_message = $OAuth->get('https://api.twitter.com/1/direct_messages.json?count=1&page=');
echo " ";
print_r ($direct_message);
echo " test
)

)

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