php - Looking for a specific word in a line of text on submit -

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so have code: if type specific word show up, example, if ($_post['text'] word smile , convert other text $out_smile. method works when comes adding text in between text "i love smile" won’t recognize "smile" recognize "i love smile". intuitively know reason that. there way add string?

if ($_post['text'] == "smile") {      $out_smile = 'my code here <img src="url">'; }

i want this. possible this?

 if (found in entire $text if there word == "smile") {      $out_smile = 'my code here <img src="url">';  }

or

  $auto_detect_left = "extra text in left hand"; //i dont know how gonna   $auto_detect_right = "extra text in right hand"; //i dont know how gonna   $out_result = ".$auto_detect_left.$text.$auto_detect_right;  if ($_post['text'] == "$out_result") {      $out_smile = 'my code here <img src="url">';  }

assuming asking verify string contained inside different string, want strpos. 

$haystack = 'arglebarglearglebargle smile!'; $needle = 'smile'; $pos = strpos($haystack, $needle);  if ($pos === false) {     //$needle not present in $haystack } else {     //$needle in $haystack @ position $pos }

please note use of ===, use mandatory in case, or not work properly. (later on should difference between == , === in php.)


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