/** * Determine whether the given object is an array: * Either an object array or a primitive array. @param obj the object to check */ Public Static Boolean IsArray (Object obj) { returnnull && obj.getclass (). IsArray (
empty-Check if a variable is empty
Statement a bug description
BOOL Empty (mixed $var)
Empty () returns FALSE if Var is a non-null or Non-zero value. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any
Empty-check whether a variable is empty
Report a bug description
Bool empty (mixed $ var)If var is a non-null or non-zero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, array (), var $ var; and objects without any
Phpempty () checks whether a variable is empty. Empty-check whether a variable is null Reportabug description boolempty (mixed $ var) if var is not null or a non-zero value, empty () returns FALSE. In other words, 0, 0,
Empty-check whether a
basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Gets the value of the array Array_keys ($arr), gets the key name of the array array_flip ($arr), and the values in the array are exchanged with the key
Basic functions of array manipulationThe key name and value of the arrayArray_values ($arr); Get the value of an arrayArray_keys ($arr); Gets the key name of the arrayArray_flip ($arr); the values in the array are exchanged with the key names (if
empty-checks if a variable is empty
Report a bug description
BOOL Empty (mixed $var)
If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any
Php basic knowledge Summary (1) array, basic knowledge array
I. Sorting1. asort-Positive Sorting to maintain the index relationship2. arsort-reverse sorting to maintain the index relationship3. sort -- sorting from the lowest to the highest4. ksort -
Php operation array (merge, split, append, search, delete, etc ). 1. the array_merge () function combines the arrays and returns a Union array. The obtained array starts with the first input array parameter.
1. Merge arrays
The array_merge ()
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