PHP Tips and Tricks

Contents:

• Type And Reference
• Chaining Spaceship
• parse_str() Edge Cases
• Cast A Closure To Array
• list() Does Not Type
• Triple Plus Operator
• Function Name In A Method
• PHP Quine
• Named Parameter In An Array
• self Is A Valid Type On A Closure
• Keep Interface New Argument Compatible
• Undefined Constant A On Its Line Of Definition
• http_build_query() And Enumerations
• Cannot indirectly modify readonly
• Ellipsis And Coalesce
• namespace namespace
• Namespace, But Far In The Name
• No Hidden Nullable
• Remove Last Item In An Array
• Cancelling Native Function
• Classes Constant Disambiguation With Parenthesis
• compact() Is Recursive
• No Final Parameter
• Is Not A NAN
• Impossible Named Arguments
• func_get_args() Skips Variadic
• Ellipsis With Array Parameters
• Named Parameter Inheritance
• __invoke() On New
• Method Or Property?
• No More Class _
• Method Not Property Name Must Be String
• Static Properties
• The New And The Parenthesis
• Fluent Function
• Cannot Use Isset On Expression, So Use What?
• Constant Redefinition
• No Class Constant In String
• Return Int Not Bool
• By Reference, Error Or Notice?
• Call Function With Strings
• Non Empty Match
• Named Sqlite3 In Memory
• Variable Creation
• All Enum Cases
• Unicode Comments
• Datetime Object, And Years
• Escaping A Regex
• Every Anonymous Class Is Different
• instanceof With Variables
• Undefined Variable
• Compatible Signature
• private Is Relaxed
• Class Implement No More
• Variadic Are Typed And Defaulted
• array_column() To Hash
• \array Was Customizable
• array Is Not An Array
• array_map_assoc() With Keys
• array_map() Goes Full Throttle
• Typed Array
• Initialize Readonly On Child
• Silent Optimisation Of Variables
• Modify String With Array Syntax
• No Force Object To String
• __invoke() Method And Properties
• Constructor Needed
• No Self Referencing Constants
• Deanonymize Class
• Noscream On Ellipsis
• Incompatible Promoted Readonlies
• Where Is The Semicolon?
• Self As Attribute
• Reading Micro-seconds
• Promoted Properties Compatibility
• Enum Are Not Linted
• Sorting With Minus
• Override With Interface
• Send An Argument To Generator
• PHP Integer Format
• Compatible Only Interface
• No Cast In Constant Expressions
• Lots Of Silly Arguments
• Child Of Attribute Is Not An Attribute
• Dynamic Class Constant
• The Function Method
• Match() With Multiple Values
• Interfaces Constants Conflicts
• Foreach() Skips Uninitialized Properties
• Casting And Power
• Attribute Without Class
• Class Is A Valid Type
• Float Precision
• Store Float As Index
• Case Insensitive Cast
• $this $this
• No Returntype But Still, Only String
• No Unknown For array_merge()
• No Returntype Enforced
• As As As
• No DNF For Catch
• new On Object
• Unfinished Class Doesn’t Compile
• Yield, Not Return By Reference
• class_exists() With Enums
• No Semicolon In Sight
• glob() With Hidden Files
• A Function Called file_append_contents()
• array_reduce() To Filter And Alter
• $this Is Not Of The Current Class
• Class Constants With Different Types
• No Change To $this
• file_put_contents() With Array Argument
• Get The Generator
• Redefine Native Functions
• A Static Method Cannot Call A Non Static Method
• Declared Before Or After
• Cast Is So Strong
• Roman Loops
• Finally Catches Exception
• Abstract Again
• Always Compatible Variadic
• Yield, Not Return
• try, catch, finally Are All Optional
• null Or Boolean As Array
• Hide Sensitive Parameter
• No Property In Interface
• Uncallable Function
• Easy Wither Call
• Array Is Full
• Const Without Parenthesis
• Cast Are Case Insensitive
• Array And Object Syntax, Not The Same Error
• When Space Matters
• array array = array()
• Cannot Yield And Never
• Class Invasion Both Ways
• Typed By Enum
• Change A Static Variable Outside Its Function
• Scalar Types Are Unqualified
• array_append() And Short Assignation
• Coalesce And Null
• All Classes Aliases
• Mixed And Untyped Are Not Compatible Types
• Abstract Constants
• Cannot Static Static Property
• More Attribute Usage
• Run Any Script In A Phar
• Static Variable Outside A Method
• Enumeration’s Cases Comparisons
• All Static Curly Syntaxes And One Wrong
• No Such Function As Empty
• Strange –> Operator
• Unexpected Keys In Array
• Recursive Generator
• Documenting Parameters
• Catch Is Optional
• Void Parameter In array_keys()
• Unsetting Properties Surprises
• Multiple Aliases
• Plus Plus Minus Minus
• Constants Can Be Impossible
• Constants Are Mutable
• Quick DTO Or VO Copy
• Stealth Generator
• Quick Serialize
• Clone Clone Clone
• Set readonly Properties Outside The Class
• Exception Polyphormism
• Exponential Minus One
• PHP Infinity Is Reachable
• Negative Squares
• Negating An Assignation
• Numeric Separators Inside A String?
• Identifier Confusions
• Relaxed Syntax With Const
• Closure To Call
• Get $this In A Static
• How To array_intersect_uassoc_insensitive()
• Class And Constant Confusion
• Don’t Forget To Yield
• Inconsistent Constructor Signatures
• foreach() With All The Same Keys
• Battle Of Definition
• Variadic All The Yields
• Refactoring strpos()
• is_a() Versus Instanceof
• Exporting Properties
• Another Cast To Int
• ReturnTypeWillChange Is For All
• URL As Comments
• Coalesce And Assignation
• Missing Methods Are Fatal
• Only Initialize With Short Assignation Coalesce
• Keys Are Integers Whenever Possible
• Fast Creation Of stdClass Objects
• An Elephpant In The Code
• Internal Static Call
• strict_types Exceptions
• Playing With Integers Limits
• Signature Compatibility Exception
• Object Is Not A Type
• Forgotten Throw
• Keywords In Namespaces
• No Warning For Unused Variables
• Self In An Interface
• instanceof Object
• stdClass Object
• A Case Of Misplaced Parenthesis
• Checking For Names At Different Times
• Integer Becomes Negative
• Not All Strings In Arrays
• Recursive Arrow Function
• null Does Not Always Equal false
• Recursive Closure
• Cast Precedence
• Enum As A Name
• Type Is Not Always Returned
• The Namespace Stack
• Catch On Interfaces