php key exists
// Here's our fruity array
$fruits = ['apple', 'pear', 'banana'];
// Use it in an `if` statement
if (array_key_exists("banana", $fruits)) {
// Do stuff because `banana` exists
}
// Store it for later use
$exists = array_key_exists("peach", $fruits);Dictionary Check Key Exist
hh = {"a":3, "b":4, "c":5}
# check if a key exists
print("b" in hh)
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