Whether the require in php is a function or a syntax

I found that require (& #039; functions. php & #039;) and require & #039; functions. php & #039;, is it a syntax or a function in php? Can we achieve this when writing the php plug-in on our own? That is, you can use my_custom & #039; parms & #039 ;. I have found that both methods can be used. require('functions.php')And require 'functions.php'In php, is it a syntax or a function? Can we achieve this when writing the php plug-in on our own? That is, it can be used in this way. my_custom 'parms'.

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I have found that both methods can be used.require('functions.php')Andrequire 'functions.php'In php, is it a syntax or a function? Can we achieve this when writing the php plug-in on our own? That is, it can be used in this way.my_custom 'parms'.

Syntax
Zend/zend_language_scanner.l

 
  "eval" {return T_EVAL;}
  
   "include" {return T_INCLUDE;}
   
    "include_once" {return T_INCLUDE_ONCE;}
    
     "require" {return T_REQUIRE;}
     
      "require_once" {return T_REQUIRE_ONCE;}
     
    
   
  
 

Zend/zend_language_parser.y

internal_functions_in_yacc:T_ISSET '(' isset_variables ')' { $$ = $3; }|T_EMPTY '(' variable ')'{ zend_do_isset_or_isempty(ZEND_ISEMPTY, &$$, &$3 TSRMLS_CC); }|T_INCLUDE expr { zend_do_include_or_eval(ZEND_INCLUDE, &$$, &$2 TSRMLS_CC); }|T_INCLUDE_ONCE expr { zend_do_include_or_eval(ZEND_INCLUDE_ONCE, &$$, &$2 TSRMLS_CC); }|T_EVAL '(' expr ')' { zend_do_include_or_eval(ZEND_EVAL, &$$, &$3 TSRMLS_CC); }|T_REQUIRE expr{ zend_do_include_or_eval(ZEND_REQUIRE, &$$, &$2 TSRMLS_CC); }|T_REQUIRE_ONCE expr{ zend_do_include_or_eval(ZEND_REQUIRE_ONCE, &$$, &$2 TSRMLS_CC); };

Zend/zend_compile.c

void zend_do_include_or_eval(int type, znode *result, const znode *op1 TSRMLS_DC) {zend_do_extended_fcall_begin(TSRMLS_C);{zend_op *opline = get_next_op(CG(active_op_array) TSRMLS_CC);opline->opcode = ZEND_INCLUDE_OR_EVAL;opline->result_type = IS_VAR;opline->result.var = get_temporary_variable(CG(active_op_array));SET_NODE(opline->op1, op1);SET_UNUSED(opline->op2);opline->extended_value = type;GET_NODE(result, opline->result);}zend_do_extended_fcall_end(TSRMLS_C);}

requireIs a keyword in PHP.

f()This usage does not meanfYes. For example,print('hi'Yes,printNot a function.