如何使用php搜索文本？
类似的东西：
<?php
$text = "Hello World!";
if ($text contains "World") {
echo "True";
}
?>
除了用工作条件替换if ($text contains "World") {。
答案 0 :(得分：40)
答案 1 :(得分：8)
您需要的是strstr()（或stristr()，就像LucaB指出的那样）。像这样使用它：
if(strstr($text, "world")) {/* do stuff */}
答案 2 :(得分：3)
如果您正在寻找一种基于多个单词的相关性对搜索结果进行排名的算法，那么只需使用PHP即可快速简便地生成搜索结果。
在PHP中实现向量空间模型
function get_corpus_index($corpus = array(), $separator=' ') {
$dictionary = array();
$doc_count = array();
foreach($corpus as $doc_id => $doc) {
$terms = explode($separator, $doc);
$doc_count[$doc_id] = count($terms);
// tf–idf, short for term frequency–inverse document frequency,
// according to wikipedia is a numerical statistic that is intended to reflect
// how important a word is to a document in a corpus
foreach($terms as $term) {
if(!isset($dictionary[$term])) {
$dictionary[$term] = array('document_frequency' => 0, 'postings' => array());
}
if(!isset($dictionary[$term]['postings'][$doc_id])) {
$dictionary[$term]['document_frequency']++;
$dictionary[$term]['postings'][$doc_id] = array('term_frequency' => 0);
}
$dictionary[$term]['postings'][$doc_id]['term_frequency']++;
}
//from http://phpir.com/simple-search-the-vector-space-model/
}
return array('doc_count' => $doc_count, 'dictionary' => $dictionary);
}
function get_similar_documents($query='', $corpus=array(), $separator=' '){
$similar_documents=array();
if($query!=''&&!empty($corpus)){
$words=explode($separator,$query);
$corpus=get_corpus_index($corpus);
$doc_count=count($corpus['doc_count']);
foreach($words as $word) {
$entry = $corpus['dictionary'][$word];
foreach($entry['postings'] as $doc_id => $posting) {
//get term frequency–inverse document frequency
$score=$posting['term_frequency'] * log($doc_count + 1 / $entry['document_frequency'] + 1, 2);
if(isset($similar_documents[$doc_id])){
$similar_documents[$doc_id]+=$score;
}
else{
$similar_documents[$doc_id]=$score;
}
}
}
// length normalise
foreach($similar_documents as $doc_id => $score) {
$similar_documents[$doc_id] = $score/$corpus['doc_count'][$doc_id];
}
// sort fro high to low
arsort($similar_documents);
}
return $similar_documents;
}
在您的情况下
$query = 'world';
$corpus = array(
1 => 'hello world',
);
$match_results=get_similar_documents($query,$corpus);
echo '<pre>';
print_r($match_results);
echo '</pre>';
<强>结果
Array
(
[1] => 0.79248125036058
)
与多个短语匹配多个单词
$query = 'hello world';
$corpus = array(
1 => 'hello world how are you today?',
2 => 'how do you do world',
3 => 'hello, here you are! how are you? Are we done yet?'
);
$match_results=get_similar_documents($query,$corpus);
echo '<pre>';
print_r($match_results);
echo '</pre>';
<强>结果
Array
(
[1] => 0.74864218272161
[2] => 0.43398500028846
)
来自How do I check if a string contains a specific word in PHP?
答案 3 :(得分：2)
这可能就是你要找的东西：
<?php
$text = 'This is a Simple text.';
// this echoes "is is a Simple text." because 'i' is matched first
echo strpbrk($text, 'mi');
// this echoes "Simple text." because chars are case sensitive
echo strpbrk($text, 'S');
?>
或许这个：
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
?>
甚至是这个
<?php
$email = 'name@example.com';
$domain = strstr($email, '@');
echo $domain; // prints @example.com
$user = strstr($email, '@', true); // As of PHP 5.3.0
echo $user; // prints name
?>
您可以在此处的文档中阅读所有相关内容：
答案 4 :(得分：1)
在我看来，strstr（）比strpos（）更好。因为strstr（）兼容PHP 4和PHP 5.但是strpos（）只与PHP 5兼容。请注意部分服务器没有PHP 5
答案 5 :(得分：0)
/* https://ideone.com/saBPIe */
function search($search, $string) {
$pos = strpos($string, $search);
if ($pos === false) {
return "not found";
} else {
return "found in " . $pos;
}
}
echo search("world", "hello world");
在线嵌入PHP：
body, html, iframe {
width: 100% ;
height: 100% ;
overflow: hidden ;
}<iframe src="https://ideone.com/saBPIe" ></iframe>
答案 6 :(得分：0)
最好的解决方法是我的方法：
在我的方法中，只能检测到完整的单词，但在其他方面则不能。
例如：$ text ='hello world！'; if（strpos（$ text，'wor'）=== FALSE）{echo'“ wor” not in string'; }
结果：strpos返回true ！！！但在我的方法中返回false。
我的方法：
公共函数searchInLine（$ txt，$ word）{
$txt=strtolower($txt);
$word=strtolower($word);
$word_length=strlen($word);
$string_length=strlen($txt);
if(strpos($txt,$word)!==false){
$indx=strpos($txt,$word);
$last_word=$indx+$word_length;
if($indx==0){
if(strpos($txt,$word." ")!==false){
return true;
}
if(strpos($txt,$word.".")!==false){
return true;
}
if(strpos($txt,$word.",")!==false){
return true;
}
if(strpos($txt,$word."?")!==false){
return true;
}
if(strpos($txt,$word."!")!==false){
return true;
}
}else if($last_word==$string_length){
if(strpos($txt," ".$word)!==false){
return true;
}
if(strpos($txt,".".$word)!==false){
return true;
}
if(strpos($txt,",".$word)!==false){
return true;
}
if(strpos($txt,"?".$word)!==false){
return true;
}
if(strpos($txt,"!".$word)!==false){
return true;
}
}else{
if(strpos($txt," ".$word." ")!==false){
return true;
}
if(strpos($txt," ".$word.".")!==false){
return true;
}
if(strpos($txt," ".$word.",")!==false){
return true;
}
if(strpos($txt," ".$word."!")!==false){
return true;
}
if(strpos($txt," ".$word."?")!==false){
return true;
}
}
}
return false;
}