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src/Illuminate/View/Compilers/Concerns/CompilesSessions.php

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<?php

namespace Illuminate\View\Compilers\Concerns;

trait CompilesSessions
{
    /**
     * Compile the session statements into valid PHP.
     *
     * @param  string  $expression
     * @return string
     */
    protected function compileSession($expression)
    {
        $expression = $this->stripParentheses($expression);

        return '<?php $__sessionArgs = ['.$expression.'];
if (session()->has($__sessionArgs[0])) :
if (isset($value)) { $__sessionPrevious[] = $value; }
$value = session()->get($__sessionArgs[0]); ?>';
    }

    /**
     * Compile the endsession statements into valid PHP.
     *
     * @param  string  $expression
     * @return string
     */
    protected function compileEndsession($expression)
    {
        return '<?php unset($value);
if (isset($__sessionPrevious) && !empty($__sessionPrevious)) { $value = array_pop($__sessionPrevious); }
if (isset($__sessionPrevious) && empty($__sessionPrevious)) { unset($__sessionPrevious); }
endif;
unset($__sessionArgs); ?>';
    }
}