About the use of reference &. When to use, when not to solve the idea

About the use of reference &. When to use, when not to
About the use of reference &. When to use, when not to

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Don't use it if you can't figure it out, Zend will optimize it.
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In general, when referencing variables, the characters are joined with (character) variables.
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The variables passed in the process of your use if that value needs to be changed. You can write it like this!
$AAA =0
Open (& $AAA)
{
$AAA = 1;
}
That's probably it!
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Very troublesome, in study
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Look at the manual, this requirement is not high, PHP Zend engine will be optimized
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Look at the C language.
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Look at the variable substitution in C.

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