Usage of if else in PHP smarty template engine

Source: Internet
Author: User
Tags foreach smarty template

Usage:

{if} {/if}

{if} {Else} {/else} {/if}

Parsing Engine:

The code is as follows
//If


$if _operators = Array (">", "<", "= =", "= =", ">=", "<=", "!=", "!==");


$is _operator = false;


$pattern _if = "/{$left _tag}ifs+ ((. *?)) {$right _tag}/";


Preg_match_all ($pattern _if, $content, $match _if);


  


if (isset ($match _if[1]) && Is_array ($match _if[1])) {


   


foreach ($match _if[1] as $key _if=> $val _if) {


foreach ($if _operators as $if _operator) {


$items = explode ($if _operator, $val _if);


if (count ($items) = 2) {


$is _operator = true;


$shift _left = substr ($items [0], 0,1);


$pop _left = substr ($items [0], 1);


$shift _right = substr ($items [1], 0,1);


      


$pop _right = substr ($items [1], 1);


$left _var = $shift _left = = ' $ '? ' $this->var_tpl_arr['. $pop _left. ' "] ': $items [0];


$right _var = $shift _right = = ' $ '? $this->var_tpl_arr["'. $pop _right. '] ': $items [1];


$content = str_replace ($match _if[0][$key _if], "<?php if ({$left _var} {$if _operator} {$right _var}) {?>", $content);


Break


} else {


continue;


     }


    }


if (! $is _operator) {


$content = str_replace ($match _if[0][$key _if], "<?php if ({$val _if}) {?>", $content);


    }


   }


  }


  


  


//If close


$pattern _if = "/{$left _tag}/if{$right _tag}/";


$replace _if = "<?php}?>;";


if (Preg_match ($pattern _if, $content)) {


$content = preg_replace ($pattern _if, $replace _if, $content);


  }





//Else


$pattern _else = "/{$left _tag}else{$right _tag}/";


$replace _else = "<?php} else {?>";


if (Preg_match ($pattern _else, $content)) {


$content = preg_replace ($pattern _else, $replace _else, $content);


  }


  


//Else close


$pattern _else = "/{$left _tag}/else{$right _tag}/";


$replace _else = "";


if (Preg_match ($pattern _else, $content)) {


$content = preg_replace ($pattern _else, $replace _else, $content);


  }

Template Presentation method:

The code is as follows

<br/>
<br/>
$var _left = = {$var _left}, $var _right = = {$var _right}<br/><br/>
Test if: $var _left>1
<br/>
{if ($var _left>1)}
<b>if > conditions set up! </b>
{/if}
<br/>

Test if: $var _left<5
<br/>
{if ($var _left<5)}
<b>if < conditions set up! </b>
{/if}
<br/>

Test if = =: $var _left== $va _right
<br/>
{if ($var _left== $va _right)}
<b>if = = Condition Set up! </b>
{Else}
<b><font color=red>if = Condition not tenable! </font></b>
{/if}

Parsed cache file:

The code is as follows

<br/>
<br/>
$var _left = = <?php echo $this->var_tpl_arr["Var_left"];? ", $var _right = = <?php echo $this->var_tpl_arr[" Var_right "];? ><br/><br/>
Test if: $var _left>1
<br/>
<?php if ($this->var_tpl_arr["Var_left"] > 1) {?>
<b>if > conditions set up! Www.111cn.net</b>
<?php}?>;
<br/>

Test if

The code is as follows
_left<5: $var
<br/>
<?php if ($this->var_tpl_arr["Var_left"] < 5) {?>
<b>if < conditions set up! </b>
<?php}?>;
<br/>

Test if = =: $var _left== $va _right

The code is as follows
<br/>
<?php if ($this->var_tpl_arr["var_left"] = = = $this->var_tpl_arr["Va_right"]) {?>
<b>if = = Condition Set up! </b>
<?php} else {?>
<b><font Color=red>if = = condition is not tenable! </b></b>
<?php}?>;
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