Traverse string with PHP

Question

I need to traverse a string and within this string will come tags from imagens I need to select the first one. I’m using the strstr() but it’s not working.

$img = strstr($texto, '%img');
echo $img;

How should I do to have the right goal ?

The reason for using this question is because I am saving a post where I give option to save with image along, but I need to preview this post where you make a thumbnail with the image. So I need to go through this string so that I can identify which image relates to that post so I can go to the folder and identify to mount the thumbnail.

Answer 1

You can use regular expressions!

To only handle the first image, you can make use of the function preg_match:

$html = 'Muita cena aqui pelo meio e com tags<br><img alt="imagem 1" src="imagem1.jpg"/><br/><img alt="imagem 2" src="imagem2.jpg"/><br/>';

preg_match('@<img.+src="(.*)".*>@Uims', $html, $matches);

echo $matches[1];

See on the Ideone.

---

If you want to handle all images, you can use the function preg_match_all:

$html = 'Muita cena aqui pelo meio e com tags<br><img alt="imagem 1" src="imagem1.jpg"/><br/><img alt="imagem 2" src="imagem2.jpg"/><br/>';

preg_match_all('/<img [^>]*src=["|\']([^"|\']+)/i', $html, $matches);

foreach ($matches[1] as $key=>$value) {
    echo PHP_EOL . $value;
}

See on the Ideone.

To limit yourself to the first, just skip the cycle to the first:

foreach ($matches[1] as $key=>$value) {
    echo PHP_EOL . $value;
    break;
}

See on the Ideone.

Answer 2

Good afternoon.

As I understand it, do you intend to get the first picture right? I was just wondering if you wanted the image source or the full tag... so I did the following.

<?php

$str = '<im src="urlexemplo/imagem1.png"/><img src="urlexemplo/imagem2.png"/>';

preg_match('/< *img[^>]*src *= *["\']?([^"\']*)[^>]+>/i', $str, $matchesSRC);

var_dump($matchesSRC);

Or you can see how it works, here.

I misplaced image 1 to show how the code works.

To get the image CRS do $matchesSRC[1] and to get the full tag $matchesSRC[0].

I hope this helps you.

Cumps, James.

Answer 3

public static function removerCaracteresEspeciaiss($str){
    $str_saida = "";
    for($i=0; $i<strlen($str); $i++){
        $num_asc = ord($str[$i]);
        if( ($num_asc>=65 && $num_asc<=90) || ($num_asc>=97 && $num_asc<=122) || ($num_asc>=48 && $num_asc<=57)){
            $str_saida .= $str[$i];
        }
    }
    return $str_saida;
}