QueryPHP

# Foreach 增强循环

Testing Is Documentation

tests/View/Compiler/CompilerForeachPlusTest.php

foreach+ 标签主要用于在模板中循环输出数据集或者多维数组。

# 普通输出

foreach+ 标签的 name 属性表示模板赋值的变量名称，因此不可随意在模板文件中改变。 id 表示当前的循环变量，可以随意指定，但确保不要和 name 属性冲突。

public function testBaseUse(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" %}
            {{ $vo->title }}  {{ $vo->people }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php echo $vo->title; ?>  <?php echo $vo->people; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# 部分输出指定开始位置和长度的记录

支持输出部分数据，例如输出其中的第 2～4 条记录。

public function testOffsetLength(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" offset="2" length='4' %}
            {{ $vo->title }} {{ $vo->people }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = array_slice($list, 2, 4);
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php echo $vo->title; ?> <?php echo $vo->people; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# 部分输出指定开始位置到结尾的所有记录

支持输出部分数据，例如输出指定开始位置到结尾的所有记录。

public function testOffset(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" offset="3" %}
            {{ $vo->title }}  {{ $vo->people }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = array_slice($list, 3);
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php echo $vo->title; ?>  <?php echo $vo->people; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# 输出偶数记录

foreach+ 还支持偶数记录的输出，基于 mod 属性来控制。

public function testMod(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" mod="2" %}
            <?php if ($mod == 1): ?>
                {{ $vo->title }} {{ $vo->people }}
            <?php endif; ?>
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php if ($mod == 1): ?>
                <?php echo $vo->title; ?> <?php echo $vo->people; ?>
            <?php endif; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

TIP

奇数记录和偶数记录规定如下，我们以数组的 0 为开始，0、2、4为偶记录，其它的都为基数记录。

# 输出奇数记录

foreach+ 还支持奇数记录的输出，基于 mod 属性来控制。

public function testMod2(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" mod="2" %}
            <?php if (0 === $mod): ?>
                {{ $vo->title }} {{ $vo->people }}
            <?php endif; ?>
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php if (0 === $mod): ?>
                <?php echo $vo->title; ?> <?php echo $vo->people; ?>
            <?php endif; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

TIP

奇数记录和偶数记录规定如下，我们以数组索引的 0 为开始，0、2、4 为偶数记录，1、3、5 为基数记录。

# 控制换行

mod 属性还用于控制一定记录的换行。

public function testMod3(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" mod="2" %}
            {{ $vo->title }} {{ $vo->people }}
            <?php if (0 === $mod): ?>
                <br>
            <?php endif; ?>
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            <?php echo $vo->title; ?> <?php echo $vo->people; ?>
            <?php if (0 === $mod): ?>
                <br>
            <?php endif; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# mod 支持变量

mod 属性支持变量。

public function testModCanBeVar(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {{~ $mod = 4 }}
        
        {% foreach+ name="list" id="vo" mod="mod" %}
            {{ $vo->title }}  {{ $vo->people }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php $mod = 4; ?>
        
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % $mod; ?>
            <?php echo $vo->title; ?>  <?php echo $vo->people; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# 输出循环索引

public function testIndex(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" index="k" %}
            {{ $k }} {{ $vo->people }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $k = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$k;
                    $mod = $k % 2; ?>
            <?php echo $k; ?> <?php echo $vo->people; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

# 输出数组的键值

如果要输出数组的键值，可以直接使用 key 变量，和循环变量不同的是，这个 key 是由数据本身决定，而不是循环控制的，这个 key 可以通过 key 属性指定。

public function testKey(): void
{
    $parser = $this->createParser();

    $source = <<<'eot'
        {% foreach+ name="list" id="vo" %}
            key: {{ $key }}
        {% :foreach+ %}
        eot;

    $compiled = <<<'eot'
        <?php if (is_array($list)):
            $index = 0;
            $tmp = $list;
            if (0 === count($tmp)):
                echo "";
            else:
                foreach ($tmp as $key => $vo):
                    ++$index;
                    $mod = $index % 2; ?>
            key: <?php echo $key; ?>
                <?php endforeach;
            endif;
        else:
            echo "";
        endif; ?>
        eot;

    $this->assertSame($compiled, $parser->doCompile($source, null, true));
}

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