Php 将搜索与正则表达式和四行上下文匹配

例如，我有这样的代码：

<?php
/**
 * Order
 *
 * The WooCommerce order class handles order data.
 *
 * @class       WC_Order
 * @version     1.6.4
 * @package     WooCommerce/Classes
 * @category    Class
 * @author      WooThemes
 */
class WC_Order {

    /** @public int Order (post) ID */
    public $id;

    /** @public string Order status. */
    public $status;

    /** @public string Order date (placed). */
    public $order_date;

    /** @public string Order date (paid). */
    public $modified_date;

    /** @public string Note added by the customer. */
    public $customer_note;

    /** @public array Order (post) meta/custom fields. */
    public $order_custom_fields;

        global $wpdb, $woocommerce;

        if ( empty( $type ) )
            $type = array( 'line_item' );

        if ( ! is_array( $type ) )
            $type = array( $type );

        $items = $this->get_items( $type );

        $count = 0;

        foreach ( $items as $item ) {
            if ( ! empty( $item['qty'] ) )
                $count += $item['qty'];
            else
                $count ++;
        }

        return apply_filters( 'woocommerce_get_item_count', $count, $type, $this );
    }

    /**
     * Return an array of fees within this order.
     *
     * @access public
     * @return array
     */
    public function get_fees() {
        return $this->get_items( 'fee' );
    }

    /**
     * Return an array of taxes within this order.
     *
     * @access public
     * @return void
     */
    public function get_taxes() {
        return $this->get_items( 'tax' );
    }

    /**
     * Get taxes, merged by code, formatted ready for output.
     *
     * @access public
     * @return void
     */
    public function get_tax_totals() {
        $taxes      = $this->get_items( 'tax' );
        $tax_totals = array();

        foreach ( $taxes as $key => $tax ) {

            $code = $tax[ 'name' ];

            if ( ! isset( $tax_totals[ $code ] ) ) {
                $tax_totals[ $code ] = new stdClass();
                $tax_totals[ $code ]->amount = 0;
            }

            $tax_totals[ $code ]->is_compound       = $tax[ 'compound' ];
            $tax_totals[ $code ]->label             = isset( $tax[ 'label' ] ) ? $tax[ 'label' ] : $tax[ 'name' ];
            $tax_totals[ $code ]->amount           += $tax[ 'tax_amount' ] + $tax[ 'shipping_tax_amount' ];
            $tax_totals[ $code ]->formatted_amount  = woocommerce_price( $tax_totals[ $code ]->amount );
        }

        return apply_filters( 'woocommerce_order_tax_totals', $tax_totals, $this );
    }

    /**
     * has_meta function for order items.
     *
     * @access public
     * @return array of meta data
     */
    public function has_meta( $order_item_id ) {
        global $wpdb;

        return $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value, meta_id, order_item_id
            FROM {$wpdb->prefix}woocommerce_order_itemmeta WHERE order_item_id = %d
            ORDER BY meta_key,meta_id", absint( $order_item_id ) ), ARRAY_A );
    }

    /**
     * Get order item meta.
     *
     * @access public
     * @param mixed $item_id
     * @param string $key (default: '')
     * @param bool $single (default: false)
     * @return void
     */
    public function get_item_meta( $order_item_id, $key = '', $single = false ) {
        return get_metadata( 'order_item', $order_item_id, $key, $single );
}

---

您不需要逐行循环文件数据。只需读取变量中的数据并应用正则表达式：

<?php
$path = $_SERVER['DOCUMENT_ROOT'] . '/wp-content/plugins/iphorm-form-builder';
foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)) as $filename) {
    if (substr($filename, -3) == 'php') {
        $context = shell_exec('grep -H -n -C4 do_action ' . escapeshellarg($filename));
        if (!empty($context)) {
            echo "found in $filename:";
            echo "<pre>";
            echo htmlentities($context);
            echo "</pre>";
        } else {
            echo "failed reading to array";
        }
    }
}

这可以通过利用内置的shell命令非常简单地完成

   Grep  searches the named input FILEs (or standard input if no files are
   named, or the file name - is given) for lines containing a match to the
   given PATTERN.  By default, grep prints the matching lines.

   -C NUM, --context=NUM
      Print  NUM lines of output context.  Places a line containing --
      between contiguous groups of matches.

   -H, --with-filename
      Print the filename for each match.

   -n, --line-number
      Prefix each line of output with the line number within its input
      file.

编辑

根据项目中有多少目录和文件，它可能无法执行。您基本上是在一个新的shell中为每个文件创建一个新进程。那不太好。如果您希望获得大量数据并稍后解析，请执行以下操作：

鉴于PHP正则表达式引擎的局限性，单靠正则表达式无法做到这一点。具体来说，这让我感到惊讶，你不能有可变长度的后面看

需要“向后看”的原因是，如果在连续行上出现了do\u action或apply\u filters，则如果没有“向后看”标题，则第一个匹配将阻止第二个匹配，即使使用了“向后看”标题，如果没有后面的外观，就无法获得第二场比赛的前两行。更不用说，我甚至不知道是否可以在结果中包含look-around断言的内容

该解决方案创建一个正则表达式来查找函数所在的行，然后使用另外两个正则表达式来查找函数前后的行。在设计正则表达式时，我注意文件的开头和结尾

这仅显示前两行和后两行。如果你想要更多，你可以使用重复，但在我看来，从尝试的解决方案来看，这正是o.p.真正想要的。
请查看此线程，以获得一些关于如何更多地关注旧问题的建议：你给出的示例代码的预期输出是什么？啊，我想我明白了。您需要的术语是“上下文”。您需要一行匹配的内容，包含4行上下文。WTF<代码>全球$wpdb，$woocommerce在class@EliasVanOotegem欢迎来到wordpress。在门口检查你的理智。@JoeFrambach:Yes的确
$arr[3]将在匹配后打印4行
并且你对文件的前4行是正确的，现在检查编辑。哎呀，这真是太棒了，我现在正在用它构建一个插件：）内容目录可以在任何地方，如果在WP上下文中使用，这是更加防弹的：
$path=WP\u CONTENT\u DIR'/插件/插件名称'嗨，乔，很抱歉耽搁了你很长时间没有靠近电脑：-）非常感谢！！！
<?php
$path = $_SERVER['DOCUMENT_ROOT'] . '/wp-content/plugins/iphorm-form-builder';
foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)) as $filename) {
    if (substr($filename, -3) == 'php') {
        $context = shell_exec('grep -H -n -C4 do_action ' . escapeshellarg($filename));
        if (!empty($context)) {
            echo "found in $filename:";
            echo "<pre>";
            echo htmlentities($context);
            echo "</pre>";
        } else {
            echo "failed reading to array";
        }
    }
}

   Grep  searches the named input FILEs (or standard input if no files are
   named, or the file name - is given) for lines containing a match to the
   given PATTERN.  By default, grep prints the matching lines.

   -C NUM, --context=NUM
      Print  NUM lines of output context.  Places a line containing --
      between contiguous groups of matches.

   -H, --with-filename
      Print the filename for each match.

   -n, --line-number
      Prefix each line of output with the line number within its input
      file.

<?php
$path = $_SERVER['DOCUMENT_ROOT'] . '/wp-content/plugins/iphorm-form-builder';
$grep = shell_exec('grep --include=*.php -RHn -C4 do_action ' . escapeshellarg($path));
$matches = explode("\n--\n", $grep);
if (empty($matches)) {
    echo "failed reading to array";
}
else {
    foreach ($matches as $match) {
        echo "<pre>";
        echo htmlentities($match);
        echo "</pre>";
    }
}

$offset = 0;
while (preg_match('/^.*?(?:apply_filters|do_action)\s*\(.+?\)\s*;.*(?:\n\r|\n|\r|$)/m', $file, $match, PREG_OFFSET_CAPTURE, $offset))
{
    $index = $match[0][1];
    $offset = $index + strlen($match[0][0]);
    $hasBefore = preg_match('/(?:.*(?:\n\r|\n|\r).*$)|[^\n\r].*$/', 
        substr($file, 0, $index), $beforeMatch);
    $hasAfter = preg_match('/^(?:.*(?:\n\r|\n|\r|$)){0,2}/', 
        substr($file, $offset), $afterMatch);

    if ($hasBefore) print_r($beforeMatch);
    print_r($match[0][0]);
    if ($hasAfter) print_r($afterMatch);
}