php method to get only the first few characters: first create a PHP sample file; then define a string; finally intercept the first 3 characters through the "substr($str, 0, 3);" method Can.
The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer
How to get only the first few characters of php ?
Read (intercept substr) the first N characters of the string in PHP or take a few characters starting from the first few characters
<?php $str = "123456789"; echo substr($str , 0 , 3);//从左边第一位字符起截取3位字符:结果:123 echo substr($str , 3 , 3);//从左边第3位字符起截取3位字符:结果:456 ?> <?php $rest = substr("abcdef", -1); // 返回 "f" $rest = substr("abcdef", -2); // 返回 "ef" $rest = substr("abcdef", -3, 1); // 返回 "d" ?>
<?php $rest = substr("abcdef", 0, -1); // 返回 "abcde" $rest = substr("abcdef", 2, -1); // 返回 "cde" $rest = substr("abcdef", 4, -4); // 返回 "" $rest = substr("abcdef", -3, -1); // 返回 "de" ?>
<?php echo substr('abcdef', 1); // bcdef echo substr('abcdef', 1, 3); // bcd echo substr('abcdef', 0, 4); // abcd echo substr('abcdef', 0, 8); // abcdef echo substr('abcdef', -1, 1); // f // 访问字符串中的单个字符 // 也可以使用中括号 $string = 'abcdef'; echo $string[0]; // a echo $string[3]; // d echo $string[strlen($string)-1]; // f ?>
Intercepting and obtaining the length of Chinese strings mb_substr()
$str = '我abc是谁'; //utf-8编码的字符串 echo mb_substr($str, 0, 2, 'utf-8'); //输出 我a $str = '我是谁'; //gbk编码的字符串 echo mb_substr($str, 0, 1, 'gbk'); //输出 我
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