PHP common functions

1) String

The main methods are: strops(), substr(), str_split(), explode(), etc. For more methods, check the PHP official manual;

<?php
/**
 * 字符串的方法:strpos()、substr()、print_r()、explode()
 */
$str="sun of beach";

//获取子字符串在当前字符串的索引位置
echo strpos($str,&#39;ea&#39;).&#39;<br/>';

//字符串的截取
$str1=substr($str,4);
$str2=substr($str,4,2);
echo $str1.'<br/>';
echo $str2.'<br/>';

//字符串的分割
$result1=str_split($str);
$result2=str_split($str,3);
$result3=explode(' ',$str);
print_r($result1);
echo '<br/>';
print_r($result2);
echo '<br/>';
print_r($result3);
echo '<br/>';

//字符串的连接
$num=500;
$str3="$str <br/>from Hanhan $num";
echo $str3;

2) Array

array_push() - used to store the value of the array;

For more methods, check out the PHP official manual;

<?php
//数组的创建:用索引创建
$arr=array();
$arr[0]='hello';
$arr[1]='php';
$arr[2]=100;
$arr[3]=3.14;
print_r($arr);
echo '<br/>';
echo $arr[2];
echo '<br/>';

//数组的创建:用key-value方式创建
$arr2=array();
$arr2['h']='hello';
$arr2['w']='world';
print_r($arr2);
echo '<br/>';
echo $arr2['h'];
echo '<br/>';

//数组的初始化
$arr3=array(0=>'jason',1=>'see','h'=>'hello','w'=>'world','name'=>'shydzc');
echo $arr3['name'];
echo '<br/>';

//数组的常用方法
$arr4=array();
for($i=0;$i<10;$i++){
    array_push($arr4,'item '.$i);
}
print_r($arr4);

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The above has introduced the common functions of PHP, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.