How PHP determines if the array exists
has an array:
Array
(
[0] =>a
[1] =>b
[2] =>c
[3] =>d
)
I want to make a judgment, for example, to determine if a known string a exists in the array and execute a statement if it exists.
------Solution--------------------
In_array ()
------Solution--------------------
References:
references: In_array ($a, $array)
If you write an if statement, that is how it is written, is
if (In_array ($a, $array) ==true)
{
}
It?
In_array return bool Value
if (In_array ($a, $array)) {
}
Alas, the same habits have been committed!!!
------Solution--------------------
References:
references: In_array ($a, $array)
If you write an if statement, that is how it is written, is
if (In_array ($a, $array) ==true)
{
}
It?
Your writing is not the best notation.
Tests exist that write:
if (In_array ($a, $array))
{
}
The test does not exist so write:
if (!in_array ($a, $array))
{
}
