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117 lines
3.6 KiB
Markdown
117 lines
3.6 KiB
Markdown
# {if},{elseif},{else}
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`{if}` statements in Smarty have much the same flexibility as PHP
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[if](https://www.php.net/if) statements, with a few added features for the
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template engine. Every `{if}` must be paired with a matching `{/if}`.
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`{else}` and `{elseif}` are also permitted. All PHP conditionals and
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functions are recognized, such as *\|\|*, *or*, *&&*, *and*,
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*is_array()*, etc.
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The following is a list of recognized qualifiers, which must be
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separated from surrounding elements by spaces. Note that items listed in
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\[brackets\] are optional. PHP equivalents are shown where applicable.
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## Qualifiers
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| Qualifier | Alternates | Syntax Example | Meaning | PHP Equivalent |
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|--------------------|------------|----------------------|--------------------------------|--------------------|
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| == | eq | $a eq $b | equals | == |
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| != | ne, neq | $a neq $b | not equals | != |
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| > | gt | $a gt $b | greater than | > |
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| < | lt | $a lt $b | less than | < |
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| >= | gte, ge | $a ge $b | greater than or equal | >= |
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| <= | lte, le | $a le $b | less than or equal | <= |
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| === | | $a === 0 | check for identity | === |
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| ! | not | not $a | negation (unary) | ! |
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| % | mod | $a mod $b | modulo | % |
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| is \[not\] div by | | $a is not div by 4 | divisible by | $a % $b == 0 |
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| is \[not\] even | | $a is not even | \[not\] an even number (unary) | $a % 2 == 0 |
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| is \[not\] even by | | $a is not even by $b | grouping level \[not\] even | ($a / $b) % 2 == 0 |
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| is \[not\] odd | | $a is not odd | \[not\] an odd number (unary) | $a % 2 != 0 |
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| is \[not\] odd by | | $a is not odd by $b | \[not\] an odd grouping | ($a / $b) % 2 != 0 |
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## Examples
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```smarty
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{if $name eq 'Fred'}
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Welcome Sir.
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{elseif $name eq 'Wilma'}
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Welcome Ma'am.
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{else}
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Welcome, whatever you are.
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{/if}
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{* an example with "or" logic *}
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{if $name eq 'Fred' or $name eq 'Wilma'}
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...
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{/if}
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{* same as above *}
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{if $name == 'Fred' || $name == 'Wilma'}
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...
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{/if}
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{* parenthesis are allowed *}
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{if ( $amount < 0 or $amount > 1000 ) and $volume >= #minVolAmt#}
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...
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{/if}
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{* you can also embed php function calls *}
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{if count($var) gt 0}
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...
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{/if}
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{* check for array. *}
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{if is_array($foo) }
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.....
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{/if}
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{* check for not null. *}
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{if isset($foo) }
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.....
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{/if}
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{* test if values are even or odd *}
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{if $var is even}
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...
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{/if}
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{if $var is odd}
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...
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{/if}
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{if $var is not odd}
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...
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{/if}
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{* test if var is divisible by 4 *}
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{if $var is div by 4}
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...
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{/if}
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{*
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test if var is even, grouped by two. i.e.,
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0=even, 1=even, 2=odd, 3=odd, 4=even, 5=even, etc.
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*}
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{if $var is even by 2}
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...
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{/if}
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{* 0=even, 1=even, 2=even, 3=odd, 4=odd, 5=odd, etc. *}
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{if $var is even by 3}
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...
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{/if}
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{if isset($name) && $name == 'Blog'}
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{* do something *}
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{elseif $name == $foo}
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{* do something *}
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{/if}
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{if is_array($foo) && count($foo) > 0}
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{* do a foreach loop *}
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{/if}
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```
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