How does PHP use UrlEncode to convert each element of an array into a format

How PHP uses UrlEncode to turn each element of an array into a format
There is an array in PHP as follows:
$array = Array (
' Test ' = ' I am testing ',
' Hello ' = ' Hi ',
' Yahoo! '
);
Print_r ($array);
The run output is: Array ([test] + = I am testing [Hello] + = hello [Yahoo] + yahoo)

The problem is:
How to convert an array to
$array = Array (
' Test ' =>urlencode (' I am the test '),
' Hello ' =>urlencode (' Hello '),
Yahoo ' =>urlencode (' Yahoo ')
);
Make the output: Array ([Test] =%ce%d2%ca%c7%b2%e2%ca%d4 [Hello] =%c4%e3%ba%c3 [Yahoo] =%d1%c5%bb%a2)

Who knows the words to help answer, first thank you ~ ~

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PHP Code

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