This is more complicated when you have multi-dimensional arrays. Like you would think to find out if they are equal or not. You can't just compare two arrays with the = operator With other operators (such as string concatenation or arithmetic operators)
The null coalescing operator has low precedence. Please note that the null coalescing operator is an expression, and that it In particular, this operator does not emit a notice or warning if the left-hand side The expression (expr1) ? (expr2) evaluates to Relying on left-associativity is deprecated as of PHP 7.4.0.Īs of PHP 8.0.0, the ternary operator is non-associative. Instead of right-associative like most other programming languages. Indeed prior to PHP 8.0.0, ternary expressions were evaluated left-associative, PHP's behaviour when using more than one unparenthesized ternary operator within a singleĮxpression is non-obvious compared to other languages. It is recommended to avoid "stacking" ternary expressions. Return-by-reference function will therefore not work and a warning is The statement return $var = 42 ? $a : $b in a Is important to know if you want to return a variable by reference. Please note that the ternary operator is an expression, and that itĭoesn't evaluate to a variable, but to the result of an expression. It is possible to leave out the middle part of the ternary operator.Įxpr1 is only evaluated once in this case. The expression (expr1) ? (expr2) : (expr3) Translate strings and resources to numbers, usual mathĪrray with fewer members is smaller, if key from operand 1 is notįound in operand 2 then arrays are incomparable, otherwise - compare not only values are compared keys must matchįor various types, comparison is done according to the followingĬomparison with Various Types Type of Operand 1Ĭonvert null to "", numerical or lexical comparisonīuilt-in classes can define its own comparison, different classesĪre incomparable, same class see Object Comparison The type conversion does not take place when the comparison is Or one operand is a number and the other one is a $a is less than, equal to, or greater than True if $a is greater than or equal to $b.Īn int less than, equal to, or greater than zero when True if $a is not equal to $b, or they are not of the same True if $a is not equal to $b after type juggling. True if $a is equal to $b, and they are of the same True if $a is equal to $b after type juggling. You may also be interested in viewingĪs they show examples of various type related comparisons.
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