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Perform an operation on every item of a list

Perform an operation on every item of a list, e.g.
for the list ["ox", "cat", "deer", "whale"] calculate
the list of sizes of the strings, e.g. [2, 3, 4, 5]
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php
$sizes = array_map('strlen', array('ox', 'cat', 'deer', 'whale'));

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