CODEWITHSUNDEEP
phpstringperformanceparsing
stdcerr
stdcerr

Reputation: 15668

extract substring at defined position

I have a html string and I want to extract a certain sub string as plain text that always starts at a defined position, how do I do this best?

the html looks like:

<table class="views-table cols-4"><thead><tr><th class="views-field views-field-line-item-title">
            Title          </th>
<th class="views-field views-field-commerce-unit-price">
            Unit price          </th>
<th class="views-field views-field-quantity">
            Quantity          </th>
<th class="views-field views-field-commerce-total views-align-right">
            Total          </th>
</tr></thead><tbody><tr class="odd views-row-first views-row-last"><td class="views-field views-field-line-item-title">
             "Sweet Heart" Package    (SPA02)          </td>
<td class="views-field views-field-commerce-unit-price">
            135.00  CAD          </td>
<td class="views-field views-field-quantity">
            1          </td>
<td class="views-field views-field-commerce-total views-align-right">
            135.00  CAD          </td>
</tr></tbody></table>

and I want to extract the string "Sweet Heart" Package (SPA02), how do I do this most efficiently?

Thanks

EDIT 1 I took Vinie's solution for a spin and just added the echo before the call to get_string() but for some reason strpos() is not able to find $start within $string which is odd as I printed them both to the screen and I can see, the contents are definitely within the string!

<?php
function get_string($string, $start, $end)
{
    $pos = 0;
    $pos = strpos($string, $start, $pos);
    if ($pos === false)
    { // Zero is not exactly equal to false...
        return $found;
    }
    $pos += strlen($start);
    $len = strpos($string, $end, $pos)-$pos;
    $found = substr($string, $pos, $len);
    return $found;
}

$str='<table class="views-table cols-4"><thead><tr><th class="views-field views-field-line-item-title">
        Title          </th>
<th class="views-field views-field-commerce-unit-price">
        Unit price          </th>
<th class="views-field views-field-quantity">
        Quantity          </th>
<th class="views-field views-field-commerce-total views-align-right">
        Total          </th>
</tr></thead><tbody><tr class="odd views-row-first views-row-last"><td class="views-field views-field-line-item-title">
         "Sweet Heart" Package    (SPA02)          </td>
<td class="views-field views-field-commerce-unit-price">
        135.00  CAD          </td>
<td class="views-field views-field-quantity">
        1          </td>
<td class="views-field views-field-commerce-total views-align-right">
 135.00  CAD          </td>
</tr></tbody></table>';

 $str=strtr($str,array("<"=>"&lt;","&"=>"&amp;"));
 echo get_string($str,'class="odd views-row-first views-row-last">&lt;td    class="views-field views-field-line-item-title">','&lt;/td>');
?>

Upvotes: 0

Views: 70

Answers (1)

Vinie
Vinie

Reputation: 2993

Use this function to extract your string.

function get_string($string, $start, $end)
{
    $pos = 0;
    $pos = strpos($string, $start, $pos);
    if ($pos === false)
    { // Zero is not exactly equal to false...
        return $found;
    }
    $pos += strlen($start);
    $len = strpos($string, $end, $pos)-$pos;
    $found = substr($string, $pos, $len);
    return $found;
}

$str='<table class="views-table cols-4"><thead><tr><th class="views-field views-field-line-item-title">
        Title          </th>
<th class="views-field views-field-commerce-unit-price">
        Unit price          </th>
<th class="views-field views-field-quantity">
        Quantity          </th>
<th class="views-field views-field-commerce-total views-align-right">
        Total          </th>
</tr></thead><tbody><tr class="odd views-row-first views-row-last"><td class="views-field views-field-line-item-title">
         "Sweet Heart" Package    (SPA02)          </td>
<td class="views-field views-field-commerce-unit-price">
        135.00  CAD          </td>
<td class="views-field views-field-quantity">
        1          </td>
<td class="views-field views-field-commerce-total views-align-right">
 135.00  CAD          </td>
</tr></tbody></table>';

 $str=strtr($str,array("<"=>"&lt;","&"=>"&amp;"));//echo $str;
 get_string($str,'class="odd views-row-first views-row-last">&lt;td    class="views-field views-field-line-item-title">','&lt;/td>');

Upvotes: 1

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