PHP array string search array_search techniques

php To search array strings, we generally use the two functions array_search and in_array

array_search() 函数与 in_array() to find a key value in the array. If the value is found, the key of the matching element is returned. If not found, returns false.

But array_search is generally used to search for the first string that meets the requirements in an array. If the searched string contains multiple strings in the array, array_search will not work. At this time, we use the array_keys() function to realize that the searched string contains multiple strings in the array.

Look at the following example:

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red'); 
$a=array_search( "blue",$array); //将输出$a=0; 
$b=array_search( 'red',$array); //将只会输出$b=1; 
$p = array_keys($array, 'red');//搜索的字符串在数组中含有多个 
if(is_array($p)) {
  foreach($p as $v) { 
    echo $val."出现在".$v . " ";
   }
}else { 
  echo $val."出现在".array_search($val, $array)." ";
}

Example 2:

$array = array(4,5,7,8,9,10); 
$found = array_search(8, $array); //调用array_search函数并输出查找结果 
if($found){ //如果找到输出键 
echo "已找到，键为".$found; 
}else{ //如果没有找到输出错误信息 
echo "没有找到"; 
}

Let’s take a look at the in_array function

Use in_array(value,array,type)

type is optional. If this parameter is set to true, it is checked whether the type of the searched data and the value of the array are the same.

$arr = array('可以','如何','方法','知道','沒有','不要');
//in_array(value,array,type)
$isin = in_array("如何2",$arr);
if($isin){
  echo "in====".$isin;
}else{
  echo "out====".$isin;
}

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