仅使用php删除第一行的单词

Question

I have text:

I have new blue car
I have new red and blue cars

How remove what word i want from first line using php?

Ex:

        $text = preg_replace("/^(blue>){1}/", "", $text);

The result should be:

I have new car
I have new red and blue cars

And i want example for remove "p br " it is posible.

<p></p><br/>I have new blue car
I have new red and blue cars

Answer 1

The following will find the first row, replace the 'blue' word on that line with nothing (remove it), strip tags and remove leading/trailing space.

• Will only remove whole words, e.g. not 'blue' in 'blues'
• Will not remove word from following lines if not found in first line
• Will not strip tags from following lines

Code:

$text = "<p></p><br/>I have new blue car
I have new <b>red<b> and blue cars";
$word = 'blue';

$text = preg_replace_callback(
    '/.*$/m', // Match single line
    function ($matches) use ($word) {
        // Remove word (\b = word boundary), strip tags and trim off whitespace
        return trim(
            strip_tags(
                preg_replace('/\b' . $word. '\s*\b/', '', $matches[0])
            )
        );
    },
    $text,
    1 // Match first line only
);

echo $text, PHP_EOL;

Output:

I have new car
I have new <b>red<b> and blue cars