traversing the array with foreach and using the & reference assignment, I can"t understand why the last value of the array element is preceded by a &
/ / Please paste the code text below (please do not replace the code with pictures)
$arr=array (1meme 2Jing 3Jing 4);
foreach ($arr as & $value) {
$value=$value*2;}
var_dump ($arr);
? >
the running result is as follows
because your foreach adds the & reference symbol, this variable is still valid at the end of the loop (foreach does not isolate scope) and is a reference variable
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