PHP in_array,trim,isset,unset,is_numeric function usage.
Let's take a look at the tutorial on how to use these functions.
In_array ($array)
This function is to determine whether the current value is the array.
EX:
$array = Array (1,2);
if (In_array ($array))
{
Die (' In_array judged it to be an array ');
}
Echo ' is not an array ';
Result:
In_array judged it to be an array of
Trim ($value)
The TRIM function is to remove null values for parameters including NULL, ""
Isset ($value)
Isset is to determine whether a variable exists
Unset ($value)
Destroying variables
Let's look at the isset,unset example.
$a = ' V ';
Isset ($a)? $a: NULL;
unset ($a);
Isset ($a)? $a: NULL;
The result:
V
Null
Is_numeric ($num)
$num = 3;
if (Is_numeric ($num))
{
Echo $num;
}
Else
{
Echo ' is not a value ';
}
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