I'm not the headline party, little brother I'm really weak

I'm not the headline party, I'm really weak.
Weak weak ask, & $a what does that mean? What is the role of &?
After asking me to dive,, too embarrassed, the basis of the variable problem ...

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Reference. Reference: http://www.php.net/manual/zh/language.references.whatdo.php
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Quoted words $b =& $a;
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Sometimes we want to modify the value of an array when we're foreach.
For example
$arr =array (a);

foreach ($arr as & $value) {
$value + +;
}

Print_r ($arr);

This time, the contents of the array become
Array
(
[0] = 2
[1] = 3
[2] = 4
)
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This thing can not be used. Write out the code, so easy to use.


Waiting for you to have a certain foundation. or encountered in the program. It's natural to understand.
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Weak weak ask, & $a what does that mean? What is the role of &?
After asking me to dive,, too embarrassed, the basis of the variable problem ...

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