Put values ​​into two-dimensional array in PHP loop

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1. Define a Array, put the value into the two-dimensional array

$a = [];$b = ['a','b','c','d'];foreach($b as $v){    $a['a'][] = $v;
}

In this way, printing this $a will get a two-dimensional array, but when using the following code, $a will get It can only get one value,

instead of putting all the values ​​in $b into $a['a']this array

$b = ['a','b','c','d'];foreach($b as $v){    $a = [];    $a['a'][] = $v;
}

At the same time, in While loops and for loops are the same, when defining an array, it must be placed outside the loop, otherwise

can only put the value of the last loop into this array

Explanation: Each loop $a is redefined once, so this phenomenon will occur.

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