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PHP 的坑
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php-ufo.md

== && ===

>>> '233' == '233 '
=> false
>>> '233' == ' 233'
=> true
>>> '233' === ' 233'
=> false

numberic

>>> is_numeric(' 233')
=> true
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zhwei commented Mar 27, 2017

array_walk

>>> $a = explode(' ', '1 2 3');
=> [
     "1",
     "2",
     "3",
   ]
>>> array_walk($a, 'intval')
=> true
>>> $a
=> [
     "1",
     "2",
     "3",
   ]
>>> $a = array_map('intval', $a)
=> [
     1,
     2,
     3,
   ]

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