Title: How to find a string inside other string Post by: atari on October 20, 2008, 01:31:12 pm Looking for a function in PHP or some way to find out if a string contains some other string.
Title: PHP Check for string inside a string Post by: mod on October 22, 2008, 05:33:10 pm Let's say you have string $haystack = "mother" and string $needle = "other".
You want to find out if $haystack contains $needle. One option is to use the strpos PHP function. Code: $pos = strpos($haystack,$needle); if($pos === false) { // string needle NOT found in haystack } else { // string needle found in haystack } !! Watch out, this can be tricky. Some people do just something like if ($pos > 0) {} or perhaps something like if (strpos($haystack,$needle)) { } and forget that your string can be right at the beginning. if (strpos($haystack,$needle)) { } does not produce the same result as our code shown above. Another option is to use strstr Code: if (strlen(strstr($haystack,$needle))>0) { echo "Needle Found"; } Strstr function is case-sensitive. For a case-insensitive search, use stristr(). The strpos() function is faster and less memory intensive. Title: Re: How to find a string inside other string Post by: bugibar on October 30, 2008, 08:48:27 pm I would include some checking for the string being empty too, maybe something like
Code: <?php function isempty($var) { if (((is_null($var) || rtrim($var) == "") && $var !== false) || (is_array($var) && empty($var))) { echo "yes<br />"; } else { echo "no<br />"; } } ?> |