Difference between revisions of "PHP/operator"
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(Created page with "==List== {| class="wikitable sortable" |- ! operator || name || example || meaning || familiarity || docs |- | == || Equal || <syntaxhighlight lang=ph...") |
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==List== | ==List== | ||
| + | (very incomplete; mainly to document the more obscure ones) | ||
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| <=> || spaceship || <syntaxhighlight lang=php inline>$a <=> $b</syntaxhighlight> || An int less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively. || common | | <=> || spaceship || <syntaxhighlight lang=php inline>$a <=> $b</syntaxhighlight> || An int less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively. || common | ||
|- | |- | ||
| − | | ?: || ternary | + | | ?: || [https://www.php.net/manual/en/language.operators.comparison.php#language.operators.comparison.ternary ternary] || <syntaxhighlight lang=php inline>$A ? $B : $C</syntaxhighlight> || "if $A is true, then $B, else $C" || less common || 2024-07-21 Currently testing to see if this can be used as an if/then replacement when there's no return value. |
|- | |- | ||
| − | | ?? || null coalescing | + | | ?? || [https://www.php.net/manual/en/language.operators.comparison.php#language.operators.comparison.coalesce null coalescing] || <syntaxhighlight lang=php inline>$A ?? $B</syntaxhighlight> || "$A if it isn't NULL, else $B" || rare |
| + | |- | ||
| + | | ??= || [https://www.php.net/manual/en/language.operators.comparison.php#language.operators.comparison.coalesce null coalescing] || <syntaxhighlight lang=php inline>$A ??= $B</syntaxhighlight> || "if $A is NULL, set it to $B"<br>equivalent to <syntaxhighlight lang=php inline>$A = $A ?? $B</syntaxhighlight> || rare | ||
| + | |- | ||
| + | | instanceof || [https://www.php.net/manual/en/language.operators.type.php type comparison] || <syntaxhighlight lang=php inline>$A instanceof $B</syntaxhighlight> || TRUE if $A is a class (or object of a class) that inherits from class $B || nonstandard || see {{l/same|inheritance}} | ||
|} | |} | ||
==Docs== | ==Docs== | ||
| − | * [https://www.php.net/manual/en/language.operators.comparison.php Comparison Operators] | + | * [https://www.php.net/manual/en/language.operators.php Operators] |
| + | ** [https://www.php.net/manual/en/language.operators.arithmetic.php Arithmetic Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.assignment.php Assignment Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.bitwise.php Bitwise Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.comparison.php Comparison Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.errorcontrol.php Error Control Operators]: the <code>@</code> operator | ||
| + | ** [https://www.php.net/manual/en/language.operators.execution.php Execution Operators]: the <code>``</code> (backtick) operator | ||
| + | ** [https://www.php.net/manual/en/language.operators.increment.php Incrementing/Decrementing Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.logical.php Logical Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.string.php String Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.array.php Array Operators] | ||
| + | ** [https://www.php.net/manual/en/language.operators.type.php Type Operators] | ||
| + | * [https://www.php.net/manual/en/language.operators.precedence.php Operator Precedence]: if it matters, use parentheses to make it unambiguous; precedence rules can change. | ||
Latest revision as of 16:23, 21 July 2024
List
(very incomplete; mainly to document the more obscure ones)
| operator | name | example | meaning | familiarity | docs |
|---|---|---|---|---|---|
| == | Equal | $a == $b |
true if $a is equal to $b after type juggling. | common | Comparison Operators |
| === | Identical | $a === $b |
true if $a is equal to $b, and they are of the same type. | common-ish | Comparison Operators |
| != | Not equal | $a != $b |
true if $a is not equal to $b after type juggling. | common | Comparison Operators |
| <> | Not equal | $a <> $b |
true if $a is not equal to $b after type juggling. | common | |
| !== | Not identical | $a !== $b |
true if $a is not equal to $b, or they are not of the same type. | common | |
| < | Less than | $a < $b |
true if $a is strictly less than $b. | common | |
| > | Greater than | $a > $b |
true if $a is strictly greater than $b. | common | |
| <= | Less than or equal to | $a <= $b |
true if $a is less than or equal to $b. | common | |
| >= | Greater than or equal to | $a >= $b |
true if $a is greater than or equal to $b. | common | |
| <=> | spaceship | $a <=> $b |
An int less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively. | common | |
| ?: | ternary | $A ? $B : $C |
"if $A is true, then $B, else $C" | less common | 2024-07-21 Currently testing to see if this can be used as an if/then replacement when there's no return value. |
| ?? | null coalescing | $A ?? $B |
"$A if it isn't NULL, else $B" | rare | |
| ??= | null coalescing | $A ??= $B |
"if $A is NULL, set it to $B" equivalent to $A = $A ?? $B |
rare | |
| instanceof | type comparison | $A instanceof $B |
TRUE if $A is a class (or object of a class) that inherits from class $B | nonstandard | see inheritance |
Docs
- Operators
- Arithmetic Operators
- Assignment Operators
- Bitwise Operators
- Comparison Operators
- Error Control Operators: the
@operator - Execution Operators: the
``(backtick) operator - Incrementing/Decrementing Operators
- Logical Operators
- String Operators
- Array Operators
- Type Operators
- Operator Precedence: if it matters, use parentheses to make it unambiguous; precedence rules can change.