鍦≒HP涓紝substr()鍑芥暟鐢ㄤ簬鑾峰彇瀛楃涓茬殑涓€涓瓙涓层€傚畠鐨勪娇鐢ㄦ柟娉曞涓嬶細

substr(string $string, int $start, int|null $length = null): string|false

• $string 琛ㄧず瑕佹埅鍙栫殑瀛楃涓层€?/p>

• $start 琛ㄧず寮€濮嬫埅鍙栫殑浣嶇疆锛屼粠0寮€濮嬭鏁般€?/p>

• $length 琛ㄧず瑕佹埅鍙栫殑闀垮害锛屽彲閫夊弬鏁般€傚鏋滀笉鎸囧畾姝ゅ弬鏁帮紝灏嗛粯璁ゆ埅鍙栦粠$start浣嶇疆鍒板瓧绗︿覆鐨勬湯灏俱€?/p>

• 杩斿洖鍊间负鎴彇寰楀埌鐨勫瓙涓诧紝濡傛灉鎴彇澶辫触鍒欒繑鍥?code>false銆?/p>

浠ヤ笅鏄竴浜涚ず渚嬶細

$str = "Hello World!";
$substring1 = substr($str, 0, 5); // 浠庝綅缃?寮€濮嬫埅鍙?涓瓧绗?/span>
echo $substring1; // 杈撳嚭 "Hello"
$substring2 = substr($str, 6); // 浠庝綅缃?寮€濮嬫埅鍙栧埌瀛楃涓叉湯灏?/span>
echo $substring2; // 杈撳嚭 "World!"
$substring3 = substr($str, -6); // 浠庡瓧绗︿覆鏈熬鍊掓暟绗?涓瓧绗﹀紑濮嬫埅鍙栧埌鏈熬
echo $substring3; // 杈撳嚭 "World!"
$substring4 = substr($str, 6, 3); // 浠庝綅缃?寮€濮嬫埅鍙?涓瓧绗?/span>
echo $substring4; // 杈撳嚭 "Wor"

璇锋敞鎰忥紝substr()鍑芥暟鏄尯鍒嗗ぇ灏忓啓鐨勶紝鍗冲ぇ鍐欏瓧姣嶄笌灏忓啓瀛楁瘝琚涓轰笉鍚岀殑瀛楃銆?/p>