How to find how many strings there are in an array in php

Method: 1. Define a counter variable and assign a value of 0; 2. Use "foreach ($arr as $val)" to traverse the array; 3. In the loop, use "is_string($val)" to judge the array Whether the element is a string, if so, add 1 to the counter variable value; 3. After the loop ends, just output the counter variable.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, find how many in the array String is to determine how many elements in the array are of string type.

Implementation idea:

• Use the foreach loop statement to traverse the array

• In the loop, use the is_string() function one by one Determine whether the array element is a string

• If so, a counter is needed to count (the counter must be defined before the loop statement, and the initial value must be 0)

Implementation code:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array(1,2,"3","4","hello",4,5,6);
$con=0; //计数器，并设置初始值为0
foreach ($arr as $val){ //在每次循环中将当前数组的值赋给 $val
	if(is_string($val)){ //判断数组元素是否为字符串
		$con++;  //如果是，计数器的值加1
	}
}
echo "数组中有 ".$con." 个字符串";
?>

It is calculated that there are three strings in the above example array. We use var_dump() to output the array details to see if Wrong:

var_dump($arr);

ok, that’s correct!

Explanation:

1. foreach statement

foreach is a statement specially designed for traversing arrays. It is a commonly used method when traversing arrays. It provides great convenience in traversing arrays; after PHP5, you can also traverse objects (foreach can only be applied to arrays and objects).

The foreach statement traverses the array regardless of the array subscript, and can be used for discontinuous index arrays and associative arrays with strings as subscripts.

Let’s first take a look at the foreach statement, which has two syntax formats:

• Grammar format 1:

foreach ($array as $value){
    语句块;
}

Traverse the given $array array and assign the value of the current array to $value in each loop.

• Syntax format 2:

foreach ($array as $key => $value){
    语句块;
}

Traverse the given $array array, and assign the value of the current array to $value, the key name is assigned to $key.

When the foreach statement loops, the pointer inside the array will move forward one step, so that the next array element will be obtained in the next loop until the end of the array is traversed, the traversal stops and the loop exits.

2. is_string() function

is_string() function is used to detect whether a variable is a string.

If the specified variable is a string, return TRUE, otherwise return FALSE.

Recommended learning: "PHP Video Tutorial"

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