PHP 的 array merge 与 + 号的差别

PHP 的 array merge 与 + 号的区别

PHP 的 array_merge 会将 数值 变成 0, 1, 2..., 就算是强制转换成字串也一样.

范例 - 使用 array_merge

<?php <br> $a1 = array(<br> ??? '9' => '0',<br> ??? '311' => '1',<br> ??? '快乐' => '2',<br> ??? '2009a' => '3');<br><br> $a2 = array(<br> ??? '2009' => '11',<br> ??? '圣诞节' => '22',<br> ??? '111a' => '33');<br><br> $amerge = array();<br><br><strong> $amerge = array_merge($a1, $a2);</strong><br><br> print_r($amerge);<br> ?>

输出结果

Array
(
??? [0] => 0
??? [1] => 1
??? [快乐] => 2
??? [2009a] => 3
??? [2] => 11
??? [圣诞节] => 22
??? [111a] => 33
)

于 官方网站查(array_merge), 使用 "+" 就可以 merge, 而且会将 key(hash、index) 值保留.

范例 - 使用 + 合并

<?php <br> $a1 = array(<br> ??? '9'???? => '0',<br> ??? '311'?? => '1',<br> ??? '快乐'?? => '2',<br> ??? '2009a' => '3'<br> );<br><br> $a2 = array(<br> ??? '2009'? => '11',<br> ??? '圣诞节' => '22',<br> ??? '111a'? => '33'<br> );<br><br> $amerge = array();<br><br><strong> $amerge = $a1 + $a2;</strong><br><br> print_r($amerge);<br> ?>

输出结果

Array
(
??? [9] => 0
??? [311] => 1
??? [快乐] => 2
??? [2009a] => 3
??? [2009] => 11
??? [圣诞节] => 22
??? [111a] => 33
)

原文网站 / 转载自: Tsung Hao

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