How to check whether the specified character is in the key value of the array in php

Steps: 1. Define variables and assign values, syntax "$con=0;"; 2. Use "foreach($arr as $v){//loop body}" to loop through the array; 3. In the loop body, use "if(strpos($v,"Character")){$c=1;break;}" to obtain the position of the specified character in the key value. If the return value is not false, the variable "$c "changes to 1, and jumps out of the loop; 4. After the loop ends, determine whether the value of the variable "$c" is 1, and if so, the specified character is in the key value of the array.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php checks the specified characters Whether it is in the key value of the array

In PHP, you can use the foreach statement and strpos() function to check whether the specified character is in the key value of the array.

Step 1: Define a variable and assign a value 0

$con=0;

Step 2: Use the foreach statement to loop through the array

foreach ($arr as $v){
    //循环体语句块;
}

Traverse Given the $arr array, the value of the current array will be assigned to $v in each loop.

Step 3: In the loop body, use the strpos() function to find the position where the specified character first appears in the element key value

• If If the return value is the character position, the value of the variable $con becomes 1, and break is used to jump out of the loop

• If the return value is false, continue searching until the end of the loop

if(strpos($v,"h")){
	$con=1;
	break;
}

Step 4: After the loop ends, determine whether the value of variable $con is 1

• If it is 1 , then the specified character is in the key value of the array

• If it is not 1, then the specified character is not in the key value of the array

if($con==1){
	echo "指定字符在数组的键值里";
}else{
	echo "指定字符不在数组的键值里";
}

Complete sample code:

<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(34, 3, "abc", 5, "php", "zfg");
var_dump($arr);
$con = 0;
foreach ($arr as $v) {
	if (strpos($v, "h")) {
		$con = 1;
		break;
	}
}
if ($con == 1) {
	echo "指定字符h在数组的键值里";
} else {
	echo "指定字符h不在数组的键值里";
}
?>

Recommended learning: "PHP Video Tutorial"

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