Which php operator has high precedence?
The precedence of an operator specifies how "tightly" it binds two expressions together. For example, in the expression When operators have equal precedence their
associativity decides how the operators are grouped. For example "-" is left-associative, so Operators of equal precedence that are non-associative cannot be used next to each other, for example Associativity is only meaningful for binary (and ternary) operators. Unary operators are either prefix or postfix so this notion is not applicable. For example Use of parentheses, even when not strictly necessary, can often increase readability of the code by making grouping explicit rather than relying on the implicit operator precedence and associativity. The following table lists the operators in order of precedence, with the highest-precedence ones at the top. Operators on the same line have equal precedence, in which case associativity decides grouping. Operator Precedence
Example #1 Associativity
Operator precedence and associativity only determine how expressions are grouped, they do not specify an order of evaluation. PHP does not (in the general case) specify in which order an expression is evaluated and code that assumes a specific order of evaluation should be avoided, because the behavior can change between versions of PHP or depending on the surrounding code. Example #2 Undefined order of evaluation
Example #3
The above example will output: -1, or so I hope -1, or so I hope x minus one equals 3, or so I hope
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$x and $y ? $a : $b; // $x and ($y ? $a : $b);?>
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F(0) || T(1) && F(2) || F(3) && ! F(4) ) { tlili dot mokhtar at gmail dot com ¶ 1 year ago
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Which operator has the highest precedence ()?The logical-AND operator ( && ) has higher precedence than the logical-OR operator ( || ), so q && r is grouped as an operand. Since the logical operators guarantee evaluation of operands from left to right, q && r is evaluated before s-- .
What is the correct operator precedence in PHP?The precedence of an operator specifies how "tightly" it binds two expressions together. For example, in the expression 1 + 5 * 3 , the answer is 16 and not 18 because the multiplication ("*") operator has a higher precedence than the addition ("+") operator. Parentheses may be used to force precedence, if necessary.
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