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This article mainly introduces the relevant knowledge of "comparative analysis of php value transfer and citation transmission examples". The editor shows you the operation process through the actual case, the operation method is simple and fast, and the practicality is strong. I hope this article "php value transfer and citation transmission example comparative analysis" can help you solve the problem.

Description

1. The php must copy the value when passed by value. This can be an expensive operation, especially for large strings and objects.

2. Reference transfer does not need to copy values, which is conducive to performance improvement.

Example

Pass by value

$a = "test"; $b = $a _ newtest _ a = "newtest"; echo $a; / export newtestecho $b; / / export test-- or $a = "test"; $b = $a _ newtest = "newtest"; echo $a; / / Export testecho $b; / / Export newtest

Reference transfer

$a = 'test';$b = & $a; / / reference assignment, $an and $b point to the same space, relative to a community $b =' newtest'; / / $b, then $a changes to echo $a; / / output newtestecho $b; / / output newtest on "comparative analysis of php by value transfer and citation transfer examples". Thank you for reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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